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87 Cards in this Set

  • Front
  • Back
Abductor Digiti Minimi of the foot

O: Medial/lateral process of posterior calcaneal tuberosity


I: Lateral side of base of proximal phalanx of 5th toe and 5th metatarsal


Action: Flexis/abducts 5th toe, supports lateral longitudinal arch


INN: Lateral plantar (S2,3)

Adductor Brevis

O: Anterior surface of inferior pubic ramus, inferior to origin of adductor longus


I: Pectineal line and superior part of the medial lip of linea aspera


Action: Adducts and flexes the thigh and helps to laterally rotate the thigh


INN: Anterior or posterior division of obturator nerve (L4, L2, L3)


Arterial Supply: obturator artery and medial circumflex femoral artery

Adductor Longus

O: Anterior surface of body of pubis, lateral to the pubic symphysis


I: Mid third of linea aspera, between the more medial adductor magnus and brevis insertions and the more lateral origin of the vastus medialis


Action: Adducts and flexes the thigh, laterally rotate hip joint


Inn: Anterior division of obturator nerve (L2, L3, L4)


AS: Obturator artery and medial circumflex femoral artery

Adductor Magnus

O: Inferior pubis ramus, ischial ramus, and inferolateral area of ischial tuberosity


I: Gluteal tuberosity of femur, medial lip of linea aspera, medial supracondylar ridge and adductor tubercle


Action: Thigh adductor, thigh flexor (horizontal fibers)/extensor (vertical fibers)


INN: Post division of obturator nerve, vertical hamstring portion innervated by tibial nerve (L2, L3, L4)


AS: Medial circumflex femoral artery, inferior gluteal artery, 1st-4th perforating arteries, obturator artery, and some superior muscular branches of poplitieal artery

Biceps Femoris - Long Head


O: Shares tendon w/ semitendinosus from superior medial quadrant of post portion of ischeal tuberosity


I: Fibular head, also on lateral collateral ligament and lateral tibial condyle


Action: Flexes knee, rotates tibia laterally, long head extends hip joint


INN: Tibial nerve (L5, S1, S2)


AS: Perforating Brances of profunda femoris artery, inferior gluteal artery, superior muscular branches of popliteal artery



Biceps Femoris - Short Head


O: Lateral lip of linea aspera, lat supracondylar ridge of femus, and lat intermuscular septum of thigh


I: Fibular head, lateral collateral lig and lateral tibial condyle


Action: Flexes knee, rotates tibia laterally


INN: Common peorneal nerve (L5, S1, S2)


AS: Perforating branches of profunda femoris, inferior gluteal, superior muscular branches of popliteal artery

Extensor Digitorum Longus


O: Lateral condyle of fibula, upper 3/4 of medial fibular shaft surface, upper part of interosseous membrane, fascia cruis, and anterior intermuscular septum


I: Splits into 4 tendon slips after inferior extensor retinaculum, each of which insert on dorsum of middle and distal phalanges as part of extensor expansion complex


Action: Extend toes 2-5 and dorsiflexes ankle


INN: Deep peroneal nerve (L4, L5, S1)


AS: Anterior tibial artery

Extensor Hallucis Longus

O: Anterior surface of fibula and adjacent interosseous membrane


I: Base and dorsal center of distal phalanx of great toe


Action: Extends big toe and dorsiflexes ankle


INN: Deep peroneal nerve (L4, L5, S1)


AS: Anterior tibial artery

Flexor Digitorum Longus

O: Post surface of tibia distal to popliteal line


I: Splits into 4 after passing through medial intermuscular septum of plantar surface of foot. These slips insert on plantar surface of bases of 2nd -5th distal phalanges


Action: Flexes toes 2-5, helps in plantar flexion of ankle


INN: Tibial Nerve (S2, S3)


AS: Muscular branch of posterior tibial artery

Flexor Hallucis Longus


O: Inferior 2/3 of post surface of fibula, lower part of interosseous membrane


I: Plantar surface of base of distal phalanx of great toe


Action: Flexes great toe, helps supinate ankle, weak plantar flexor of ankle


INN: Tibial nerve (S2, S3)


AS: Muscular branch of peroneal and post tibial artery

Gastrocnemius


O: Medial head from post nonarticular surface of medial femoral condyle, lat head from lat surface of femoral lat condyle


I: 2 heads unite into broad aponeurosis which unites w/ deep tendon of soleus to form Achilles, inserting on middle 1/3 of calcaneal surface


Action: powerful plantar flexor of ankle


INN: Tibial nerve (S1, S2)
AS: Each head supplied by a sural branch of popliteal artery

Gluteus Maximus


O: Post aspect of dorsal ilium post to post gluteal line, post superior iliac crest, post inferior aspect of sacrum and coccyx, and sacrotuberous ligament


I: Fascia lata at iliotibial band, also into gluteal tuberosity on posterior femoral surface


Action: Major extensor of hip joint, assists in laterally rotating thigh, upper and mid third section of muscles are abductors


INN: Inferior Gluteal Nerve (L5, S1, S2)


AS: Inf and Sup gluteal arteries and the 1st perforating branch of the profunda femoris artery

Gluteus Medius


O: Dorsal ilium inferior to iliac crest


I: Lat and sup surfaces of greater trochanter


Action: Major abductor of thigh, anterior fibers rotate hip medially, post fibers rotate hip laterally


INN: Superior gluteal nerve (L4, L5, S1)


AS: Superior gluteal artery

Gluteus Minimus


O: Dorsal ilium between inf and ant gluteal lines also from edge of greater sciatic notch


I: Ant surface of greater trochanter


Action: Abducts and medially rotates the hip joint


INN: Superior gluteal nerve (L4, L5, S1)


AS: Superior gluteal artery

Gracilis


O: Inferior margin of pubic symphysis, inferior ramus of pubis and adjacent ramus of ischium


I: Medial surface of tibial shaft, just posterior to Sartorius


Action: Flexes knee, adducts thigh, medially rotates tibia on femur


INN: Anterior division of obturator nerve (L2, L3)


AS: Obturator artery, medial circumflex femoral artery, muscular branches of profunda femoris artery

Iliacus


O: upper 2/3 of iliac fossa of ilium, internal lip of iliac crest, lat aspect of sacrum, ventral sacroiliac lig and lower portion of iliolumbar lig


I: Lesser trochanter


Action: Flex torso and thigh w/ respect to each other


INN: Muscular branch of femoral nerve (L1, L2, L3)


AS: Lumbar branch of iliopsoas branch of internal iliac artery

Inferior Gemellus


O: Posterior portions of ischial tuberosity and lateral obturator ring


I: Medial surface of greater trochanter of femur


Action: Rotates thigh laterally, helps abduct flexed thigh


INN: Nerve to oberator internum and inferior gemellus -- a branch of sacral plexus (L5, S1)


AS: Inferior gluteal artery

Obturator Externus


O: External surface of obturator membrane and anterior bony margins of obturator foramen


I: Posteromedial surface of greater trochanter of femus


Action: Rotates thigh laterally, also helps adduct thigh


INN: Post division of obturator nerve (majority), vertical/hamstring portion innervated by tibial nerve (L3, L4)


AS: Obturator and medial circumflex femoral arteries

Obturator Internus


O: Internal surface of obturator membrane and post bony margins of obturator foramen


I: Medial surface of greater trochanter of femur


Action: Rotates thigh laterally, helps abduct thigh when its flexed


INN: nerve to obturator internus and superior gemellus -- branch of sacral plexus (L5, S1)


AS: internal pudendal and sup and inf gluteal arteries

Pectineus


O: Pecten pubis and pectinial surface of pubis


I: Pectineal line of femur


Action: Adducts thigh, flexes hip


INN: Femoral nerve (L2, L3, L4), may receive inn by obturator nerve too


AS: medial circumflex femoral branch of femoral artery

Peroneus Brevis


O: Inf 2/3 of lateral fibular surface, ant and post intermuscular septa of leg


I: Lat surface of styloid process of 5th metatarsal base


Action: Everts foot and plantar flexes ankle


INN: Superficial peroneal nerve (L5, S1, S2)


AS: Muscular branches of peroneal artery

Peroneus Longus


O: Head of fibula, upper 2/3 of lat fibular shaft surface, ant and post intermuscular septa of leg


I: Plantar posterolateral aspect of medial cuniform and lat side of 1st metatarsal base


Action: Everts foot and plantar flexes ankle, helps support tranverse arch of foot


INN: Superficial peroneal nerve (L5, S1, S2), addionally may receive inn from common or deep peroneal nerves


AS: Anterior tibial and peroneal arteries

Peroneus Tertius


O: Arises w/ extensor digitorum longus from medial fibular shaft surface and ant intermuscular septum


I: Dorsal surface of base of 5th metatarsal


Action: Works w/ extensor digitorum longus to dorsiflex, everts and abducts the foot


INN: Deep peroneal nerve (L5, S1)


AS: Anterior tibial artery

Piriformis


O: Ant surface of lat process of sacrum and gluteal surface of ilium @ margin of greater sciatic notch


I: Sup border of greater trochanter


Action: Lateral rotator of hip joint, also helps abduct hip if flexed


INN: Piriformis nerve (L5, S1, S2)


AS: Sup and inf gluteal and internal pudendal arteries

Plantaris


O: Inferior aspect of lateral supracondylar line of distal femur


I: Middle 1/3 of posterior calcaneal surface, just medial to Achilles tendon


Action: Plantar flexor of ankle, also flexes knee


INN: Tibial nerve (L5, S1, S2)


AS: sural arteries

Popliteus


O: Ant part of the popliteal groove on lateral surface of lateral femoral condyle


I: Post surface of tibia in fan-like fashion, just superior to popliteal line


Action: Rotates knee medially, flexes leg on thigh


INN: Tibial nerve (L4, L5, S1)


AS: Medial inferior genicular branch of popliteal artery and muscular branch of posterior tibial artery

Psoas


O: Ant surfaces and lower borders of transverse processes of L1-L5 and bodies, discs of T12-L5


I: Lesser Trochanter


Action: Flex torso and thigh w/ respect to each other


INN: Direct fibers of L1-L3 of lumbar plexus (L1, L2, L3)


AS: Lumbar branch of iliopsoas branch of internal iliac artery

Quadratus Femoris


O: Lat margin of obturator ring above ischial tuberosity


I: Quadrate tubercle and adj bone on intertrochanteric crest of proximal posterior femur


Action: Rotates hip laterally, helps adduct hip


INN: Quadratus femoris branch of nerve to quadratus femoris and inferior gemellus (L5, S1)


AS: Medial circumflex femoral artery, inferior gluteal artery, 1st-4th perforating arteries, obturator artery and some superior muscular branches of popliteal artery

Rectus Femoris


O: Strait head from anterior inferior iliac spine, reflected head from groove just above acetabulum


I: Base of patella to from more central portion of quadriceps femoris tendon


Action: extends knee


INN: Muscular branches of femoral nerve (L2, L3, L4)


AS: lateral circumflex femoral artery

Sartorius


O: Anterior superior iliac spine


I: Sup aspect of medial surface of tibial shaft near tibial tuberosity


Action: Flexes and laterally rotates hip joint, flexes knee


INN: Femoral nerve (L2, L3, L4)


AS: muscular branches of femoral artery

Semimembranosus


O: Sup lateral quadrant of ischeal tuberosity


I: Post surface of medial tibial condyle


Action: Extends thigh, flexes knee, rotates tibia medially especially when knee if flexed


INN: Tibial nerve (L5, S1, S2)


AS: Perforating branches of profunda femoris artery, inferior gluteal artery and the superior muscular branches of popliteal artery

Semitendinosus


O: From common tendon w/ long head of biceps femoris from sup medial quadrant of post portion of the iscial tuberosity


I: Superior aspect of medial portion of tibial shaft


Action: Extends thigh and flexes knee, rotates tibia medially (more so when knee is flexed)


INN: Tibial nerve (L5, S1, S2)


AS: Perforating branches of profunda femoris artery, inferior gluteal artery, and superior muscular branches of popliteal artery

Soleus


O: Post aspect of fibular head, upper 1/3 of post surface of fibula, middle 1/3 of medial border of tibial shaft, post surface of tendinous arch spanning the two sites of bone origin


I: Unites w/ gastrocnemius aponeruosis to form Achilles tendon, inserting on middle 1/3 of posterior calcaneal surface


Action: Powerful plantar flexor of ankle


INN: Tibial nerve (S1, S2)


AS: Posterior tibial, peroneal, and sural arteries

Superior Gemellus


O: Ischial spine


I: Medial surface of greater trochanter of femur


Action: Rotates thigh laterally, helps abduct flexed thigh


INN: Nerve to obturator internus and superior gemellus -- a branch of the sacral plexus (L5, S1)


AS: Inferior gluteal artery

Tensor Fascia Lata


O: Ant superior iliac spine, outer lip of ant iliac crest and fascia lata


I: Iliotibial band


Action: Stabilize and steady hip and knee joints by putting tension of iliotibial band of fascia


INN: Superior gluteal nerve (L4, L5, S1)


AS: superior gluteal and lateral circumflex femoral artery

Tibialis Anterior


O: Lat condyle of tibia, proximal 1/2 or lat surface of tibial shaft, interosseous membrane and deep surface of fascia cruris


I: Medial and plantar surfaces of 1st cuneiform and on base of first metatarsal


Action: Dorsifelxor of ankle and invertor of foot


INN: Deep peroneal nerve (L4, L5, S1)


AS: Anterior tibial artery

Tibialis Posterior


O: Post Aspect of interosseous membrane


I: Splits into 2 slips after passing inferior to plantar calcaneonavicular ligament. Superficial slip inserts on tuberosity of navicular bone, deeper slop divides again and inserts on plantar surfaces of metatarsals 2-4 and 2nd cuneiform


Action: Principal invertor of foot, adducts foot, plantar flexes ankle, helps supinate foot


INN: Tibial nerve (L4, L5)


AS: Muscular branches of sural, peroneal, and posterior tibial arteries

Vastus Intermedius


O: Superior 2/3 of anterior and lateral surfaces of femur


I: Lat border of patella, also forms deep portion of quadriceps tendon


Action: Extends knee


INN: Muscular branches of femoral nerve (L2, L3, L4)


AS: Lateral circumflex femoral artery

Vastus Lateralis


O: Sup portion of intertrocharteric line, ant and inf borders of greater trochanter, superior portion of lat lip of linea aspera and lat portion of gluteal tuberosity of femur


I: Lat base and border of patelly, forms lateral patellar retinaculum and lat side of quadriceps femoris tendon


Action: Extends knee


INN: Muscular branches of femoral nerve (L2, L3, L4)


AS: lateral circumflex femoral artery

Vastus Medialis


O: Inf portion of intertrochanteric line, spiral line, medial lip of linea aspera, sup part of medial supracondylar ridge of femur and medial intermuscular septum


I: Medial base and border of patella, also forms medial patellar retinaculum and medial side of quadriceps femoris tendon


Action: Extend knee


INN: Muscular branches of femoral nerve (L2, L3, L4)


AS: femoral artery, profunda femoris artery and superior medial genicular branch of popliteal artery

Abductor Digiti Minimi of the Hand


O: Pisiform


I: Medial sd of base of proximal phalanx of little finger


Action: Abducts little finger


INN: Deep branch of ulnar nerve (C8, T1)


AS: Ulnar artery

Abductor Pollicis Brevis


O: Flexor retinaculum and tubercles of scaphoid and trapezium


I: Lat sd of base of proximal phalanx of thumb


Action: Abducts thumb and helps oppose it


INN: Recurrent branch of median nerve (C8, T1)


AS: Superficial palmar branch of radial artery

Abductor Pollicis Longus


O: Posterior surfaces of ulna, radium and interosseous membrane


I: Base of 1st metacarpal


Action: Abducts thumb and extends it @ carpometacarpal joint


INN: Posterior interosseous nerve (continuation of deep branch of radial nerve (C7, C8)


AS: Posterior interosseous artery

Adductor Pollicis


O: Oblique head, bases of 2nd and 3rd metacarpals, capitate and adjacent carpals, transverse head, ant surface of body of 3rd metacarpal


I: Medial side of base of proximal phalanx of thumb


Action: Draws 1st metacarpal literally to oppose thumb toward center of palm and rotates it medially


INN: Deep branch of ulnar nerve (C8, T1)


AS: deep palmar arterial arch

Anconeus


O: Lateral epicondyle of humerus


I: Lat surface of olecranon and sup part of post surface of ulna


Action: Assists triceps in extending forearm, stabilizes elbow joint, abducts ulna during pronation


INN: Radial Nerve (C7, C8, T1)


AS: middle collateral branch of deep brachial artery; recurrent interosseous artery

Biceps Brachii


O: Short head - tip of coracoid process of scapula, Long head - supraglenoid tubercle of scapula


I: tuberosity of radius and fascia of forearm via bicipital aponeurosis


Action: Supinates forearm and when it is supine, flexes forearm


INN: Musculocutaneous nerve (C5, C6)


AS: muscular branches of brachial artery

Brachialis


O: Distal half of ant surface of humerous


I: Coroniod process and tuberosity of ulna


Action: Major flexor of forearm - flexes forearm in all positions


INN: Musculocutaneous nerve (C5, C6)


AS: muscular branches of brachial artery, recurrent radial artery

Brachioradialis


O: Proximal 2/3 of lateral supracondyle ridge of humerous


I: Lat surface of distal end of radius


Action: Flexes forearm


INN: Radial nerve (C5, C6, C7)


AS: Radial recurrent artery

Coracobrachialis


O: Tip of coracoid process of scapula


I: Middle 1/3 of medial surface of humerus


Action: Helps to flex and adduct arm


INN: Musculocutaneous nerve (C5, C6, C7)


AS: muscular branches of brachial artery

Deltoid


O: Lat 1/3 of clavicle, acromion and spine of scapula


I: Deltoid tuberoisity of humerus


Action: Ant part - flexes and medially rotates arm, Middle part - abducts arm, Post part - extends and laterally rotates arm


INN: Axillary nerve (C5, C6)


AS: deltoid branch of thoracoacromial artery

Extensor Carpi Radialis Brevis


O: Lateral epicondyle of humerous


I: Base of 3rd metacarpal


Action: Extend and abduct hand at wrist joint


INN: Deep branch of radial nerve (C7, C8)


AS: Radial artery

Extensor Carpi Radialis Longus


O: Lateral supracondyle ridge of humerous


I: Base of 2nd metacarpat


Action: Extend and abduct hand @ wrist joint


INN: Radial nerve (C6, C7)


AS: radial artery

Extensor Carpi Ulnaris


O: Lateral epicondyle of humerous and post border of ulna


I: base of 5th metacarpal


Action: Extends and adducts hand @ wrist joint


INN: Post interosseous nerve - the continuation of the deep branch of the radial nerve (C7, C8)


AS: ulnar artery

Extensor Digiti Minimi of the hand


O: Lateral epicondyle of humerous


I: Extensor of expansion of 5th digit


Action: Extends 5th digit @ metacarpophalangeal and interphalangeal joints


INN: Post interossous nerve - the continuation of the deep branch of the radial nerve (C7, C8)


AS: interosseous recurrent artery

Extensor Digitorum


O: Lateral epicondyle of humerous


I: Extensor expansions of medial 4 digits


Action: Extend medial 4 digits @ metacarpophalangeal joints, extends hand @ wrist joint


INN: Post interosseous nerve - the continuation of the deep branch of the radial nerve (C7, C8)


AS: interosseous recurrent and posterior interooseous arteries

Extensor Indicis


O: Post surface of ulna and interosseous membrane


I: Extensor expansion of 2nd digit


Action: Extends 2nd digit and helps to extend hand


INN: Post interosseous nerve - continuation of deep branch of radial nerve (C7, C8)


AS: posterior interosseous artery

Extensor Pollicis Brevis


O: Post surfaces of radius and interosseous membrane


I: Base of proximal phalanx of thumb


Action: Extends proximal phalanx of thumb at carpometacarpal joint


INN: Post interosseous nerve - continuation of the deep branch of the radial nerve (C7, C8)


AS: Posterior interosseous artery

Extensor Pollicis Longus


O: Post surface of middle 1/3 of ulna and interosseous membrane
I: Base of distal phalanx of thumb


Action: Extends distal phalanx of thumb @ carpometacarpal and interphalangeal joints


INN: Post interosseous nerve - continuation of the deep branch of radial nerve (C7, C8)


AS: Posterior interosseous artery

Flexor Carpi Radialis


O: Medial epicondyle of humerus


I: Base of 2nd metacarpal


Action: Flexes and abducts hand @ wrist


INN: Median nerve (C6, C7)


AS: Ulnar artery

Flexor Carpi Ulnaris


O: Humeral head (medial epicondyle of humerous), Ulnar head (olecranon and posterior border of ulna)


I: Pisiform bone, hook of hamate bone, and 5th metacarpal bone


Action: Flexes and adducts hand at wrist


INN: Ulnar nerve (C7, C8)


AS: ulnar artery

Flexor Digitorum Profundus


O: Prox 3/4 of medial and anterior surfaces of ulna and interosseous membrane


I: Base of distal phalanx of digits 2-5


Action: Flexes distal phalanges @ distal interphalangeal joints of medial 4 digits; assists w/ flexion of hand


INN: Medial part - ulnar nerve, Lateral part - anterior interosseous branch of median nerve (C8, T1)


AS: ulnar and anterior interosseous arteries

Flexor Digiti Minimi Brivis


O: Hook of hamate and flexor retinaculum


I: Medial sd of base of proximal phalanx of little finger


Action: Flexes proximal phalanx of little finger


INN: Deep branch of ulnar nerve (C8, T1)


AS: ulnar artery

Flexor Digitorum Superficialis


O: Humeroulnar head - medial epicondyle of humerous, ulnar collateral ligament and coronoid process of ulna; Radial head - superior half of anterior border of radius


I: bodies of middle phalanges of digits 2-5


Action: Flexes middle phalanges @ proximal interphalangeal joints of medial 4 digits, flexes proximal phalanges @ metacarpophalnageal joints and hand


INN: Median nerve (C7, C8, T1)


AS: ulnar artery

Flexor Pollicis Brevis


O: Flexor retinaculum and tubercles of scaphoid and trapezium


I: Lat sd of base of prox phalanx of thum


Action: Flexes thumb


INN: Recurrent branch of median nerve (C8, T1)


AS: superficial palmar branch of the radial artery

Flexor Pollicis Longus


O: Ant surface of radius and adjacent interosseous membrane


I: Base of distal phalanx of thub


Action: Flexes phalanges of 1st digit


INN: Anterior interosseous nerve from median nerve (C8, T1)


AS: anterior interosseous artery

Infraspinatus

O: Infraspinous fossa of scapula


I: Middle facet on greater tuberosity of humerous


Action: Laterally rotate arm, helps to hold humeral head in glenoid cavity of scapula


INN: Suprascapular nerve (C5, C6)


AS: suprascapular and circumflex scapular arteris

Interosseous Muscles, Dorsal


O: Dorsal 1-4 -- Adjacent sides of 2 metacarpals


I: Dorsal 1-4 -- Extensor expansions and bases of proximal phalanges of digits 2-4


Action: Dorsal 1-4 -- Abduct digits from axial line and act w/ lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints


INN: Deep branch of ulnar nerve (C8, T1)


AS: Dorsal 1-4: Dorsal and palmar metacarpal arteries


Interosseous Muscle, Palmar


O: Palmar 1-3 -- palmar surfaces of 2nd, 4th and 5th metacarpals


I: Palmar 1-3 -- extensor expansions of digits and bases of proximal phalanges of digits 2, 4 and 5


Action: Palmar 1-3 -- adduct digits toward axial line and assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints


INN: Deep branch of ulnar nerve (C8, T1)


AS: Palmar 1-3, Palmar metacarpal arteries

Latissimus Dorsi


O: Spinous processes of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest and inferior 3 or 4 ribs


I: Floor of intertubercular groove of humerous


Action: Extends, adducts, and medially rotates humerus, raises body toward arms during climbing


INN: Thoracodorsal nerve (C6, C7, C8)


AS: Thoracodorsal artery

Levator Scapulae


O: Post tubercles of transverse processes of C1-C4 vertebrae


I: Superior part of medial border of scapula


Action: Elevates scapula and tilts its glenoid cavity inferiorly by rotating scapula


INN: Dorsal scapular (C5) and Cervical (C3, C4) nerves


AS: Dorsal scapular artery

Opponens Digiti Minimi


O: hook of hamate and flexor retinaculum


I: medial border of 5th metacarpal


Action: Draws 5th metacarpal anteriorly and rotates it, bringing little finger into opposition with thumb


INN: Deep branch of ulnar nerve


AS: ulnar artery



Opponens Pollicis


O: Flexor retinaculum and tubercles of scaphoid and trapezium


I: Lateral sd of 1st metacarpal


Action: Draws 1st metacarpal laterally to oppose thumb toward center of palm and rotates it medially


INN: Recurrent branch of median nerve (C8, T1)


AS: Superficial palmar branch of radial artery

Palmaris Longus


O: Medial epicondyle of humerus


I: Distal half of flexor retinaculum and palmar aponeuroiss


Action: Flexes hand at wrist and tightens palmar aponeurosis


INN: Median nerve (C7, C8)


AS: ulnar artery

Pectoralis Major


O: Clavicular head - ant surface of medial half of clavicle; Sternocostal head: anterior surface of sternum, superior 6 cartilages and aponeurosis of external oblique muscle


I: Lateral lip of intertubercular groove of humerous


Action: Adducts and medially rotates humerus, draws scapula anteriorly and inferiorly; acting alone: clavicular head flexes humerous and sternocostal head extends it


INN: Lateral and medial pectoral nerves: clavicular head (C5, C6), sternocostal head (C7, C8, T1)


AS: Pectoral branch of the thoracoacromial trunk

Pectoralis Minor


O: 3rd to 5th ribs near costal cartilages


I: Medial border and superior surface of coracoid processes of scapula


Action: Stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall


INN: Medial pectoral nerves, clavicular head (C8 and T1)


AS: Pectoral branch of the thoracoacromial trunk

Pronator Quadratus


O: distal 1/4 of anterior surface of ulna


I: Distal 1/4 of ant surface of radius


Action: Pronates forearm; deep fibers bind radius and ulna together


INN: Ant interosseous nerve from median nerve (C8 and T1)


AS: Anterior interosseous artery

Pronator Teres


O: Medial epicondyle of humerus and coronoid process of ulna


I: Middle of lat surface of radius


Action: Pronates and flexes forearm @ elbow


INN: Median nerve (C6, C7)


AS: ulnar artery, anterior recurrent ulnar artery

Rhomboid Major and Minor


O: Minor - nuchal ligament and spinous process of C7 and T1 verbebrae; Major - spinous processes of T2-T5 vertebrae


I: Medial border of scapula from level of spine to inferior angle


Action: Retract scapula and rotate it to depress glenoid cavity; fix scapula to thoracic wall


INN: Dorsal scapular nerve (C4, C5)


AS: Dorsal scapular artery

Serratus Anterior


O: Superolateral surfaces of upper 8 or 9 ribs @ side of chest


I: Vertebral border of scapula


Action: Draws scapula forward and upward; abducts scapula and rotates it; stabilizes vertebral border of scapula


INN: Long thoracic nerve (C5, C6, C7)


AS: circumflex scapular artery

Subscapularis


O: Subscapular fossa of scapula


I: Lesser tuberosity of humerus


Action: Medially rotates arm and adducts it; helps to hold humeral head in glenoid cavity of scapula


INN: Upper and lower subscapular nerves (C5, C6, C7)


AS: subscapular artery

Supinator


O: Lateral epicondyle of humerus, radial collateral and annular ligaments, supinator fossa and crest of ulna


I: Lateral, posterior, and anterior surfaces of proximal 1/3 of radius


INN: Deep branch of radial nerve (C5, C6)


AS: recurrent interosseous artery

Supraspinatus



O: Supraspinous fossa of scapula


I: Superior facet of greater tuberosity of humerous


Action: initiates and assists deltoid in abduction of arm and acts w/ other rotator cuff muscles


INN: Suprascapular nerve (C4, C5, C6)


AS: suprascapular artery

Teres Major


O: Dorsal surface of inferior angle of scapula


I: Medial lip of intertubercular groove of humerus


Action: Adducts and medially rotates arm


INN: Lower subscapular nerve (C6, C7)


AS: subscapular and circumplex scapular arteries

Teres Minor


O: Superior part of lateral border of scapula


I: Inferior facet on greater tuberosity of humerus


Action: Laterally rotate arm; helps to hold humeral head in glenoid cavity of scapula


INN: Axillary nerve (C5, C6)


AS: subscapular and circumflex scapular arteries

Trapezius


O: Medial third of superior nuchal line; external occipital protuberance, nuchal ligament and spinous processes of C7-T12 vertebrae


I: Lateral 1/3 of clavicle, acromion and spine of scapula


Action: elevates, retracts and rotates scapula; superior fibers elevate, middle fibers retract, and inferior fibers depress scapula; superior and inferior fibers act together in superior rotation of scapula


INN: Spinal root of accessory nerve (CN XI - motor), cervical nerves (C3, C4 - pain and proprioception)


AS: transverse cervical artery

Triceps Brachii




O: Long head - infraglenoid tubercle of scapula; Lateral head - posterior surface of humerus, superior to radial groove; Medial head - posterior surface of humerus, inferior to radial groove


Action: chief extensor of forearm: Long head -steadies head of abducted humerus


INN: Radial nerve (C6, C7, C8)


AS: Branches of deep brachial artery