Muscle O I A

Front 1

Sternocleidomastoid

Back 1

O = Sternum and Clavicle

I = Mastoid process of temporal bone

A = Flexes neck

Front 2

Pectoralis Major

Back 2

O = Clavicle and Sternum

I = Intertubercular sulcus of humerus

A = Flexes, Adducts, and Medially rotates humerus

Front 3

Pectoralis Minor

Back 3

O = Ribs 3-5

I = Coracoid process of scapula

A = Depresses and Protracts scapula

Front 4

Scalenes: Anterior, Middle, Posterior

Back 4

O = Transverse processes of cervical vertebrae

I = First and Second Ribs

A = Flex and Rotate neck; Assist in inspiration

Front 5

Internal and External Intercostals

Back 5

O = Lower border of rib

I = Upper border of next rib

A = Elevates ribs for inspiration

Front 6

Latissimus Dorsi

Back 6

O = By aponeurosis from thoracic, lumbar, and sacral spinous processes

I = Intertubercular sulcus of humerus

A = Extends, Adducts, and Medially rotates humerus

Front 7

Trapezius

Back 7

O = Occipital bone, cervical and thoratic vertebrae

I = Clavicle and Spine of scapula to acromion

A = Elevates clavicle; Adducts, elevates and depresses scapula; extends head

Front 8

Levator Scapulae

Back 8

O = Spines of C1-C4 vertebrae

I = Superior vertebral border of scapula

A = Elevates scapula

Front 9

Rhomboids (Major and Minor)

Back 9

O = C7-T5 thoracic spinous process

I = Vertebral border of scapula

A = Elevates and adducts scapula and rotates it downward; stabilizes scapula

Front 10

Serratus Anterior

Back 10

O = Upper 8 ribs

I = Vertebral border and inferior angle of scapula

A = Rotates scapula

Front 11

Teres Major

Back 11

O = Inferior angle and axillary border of scapula

I = Intertubercular sulcus of humerus

A = Extends and medially rotates humerus

Front 12

Supraspinatus

Back 12

O = Supraspinous fossa

I = Greater tubercle of humerus

A = Abducts humerus

Front 13

Infraspinatus

Back 13

O = Infraspinous fossa

I = Greater tubercle of humerus

A = Adducts and laterally rotates humerus

Front 14

Teres Minor

Back 14

O = Inferior axillary border of scapula

I = Greater tubercle of humerus

A = Extends and laterally rotates humerus

Front 15

Subscapularis

Back 15

O = Subscapular fossa

I = Lesser tubercle of humerus

A = Medially rotates humerus

Front 16

Deltoid

Back 16

O = Acromion and spine of scapula and acromial end of clavicle

I = Deltoid tuberosity of humerus

A = Abducts, flexes, extends, and medially and laterally rotates humerus

Front 17

Coracobrachialis

Back 17

O = Coracoid process of scapula

I = Medial surface of humerus

A = Flexes and adducts humerus

Front 18

Biceps Brachii

Back 18

O = Coracoid process and supraglenoid tubercle

I = Radial tuberosity

A = Flexes arm; flexes and supinates forearm

Front 19

Brachialis

Back 19

O = Distal, anterior surface of humerus

I = Coronoid process of ulna

A = Flexes forearm

Front 20

Triceps, 3 Heads: Long, Lateral, Medial

Back 20

O = Infraglenoid tubercle of scapula; lateral and posterior surface of humerus

I = Olecranon process of ulna

A = Extends arm and forearm

Front 21

External Oblique

Back 21

O = Lower eight ribs

I = Linea alba and iliac crest

A = Compresses abdomen

Front 22

Internal Oblique

Back 22

O = Iliac Crest

I = Linea Alba

A = Compresses abdomen

Front 23

Transversus Abdominis

Back 23

O = Lower 6 ribs and iliac crest

I = Linea Alba

A = Compresses abdomen

Front 24

Rectus Abdominis

Back 24

O = Pubic symphysis

I = Costal cartilage

A = Compresses abdomen and flexes vertebral column

Front 25

Gluteus Maximus

Back 25

O = Iliac Crest

I = Iliotibial tract of fascia lata

A = Extends and laterally rotates femur

Front 26

Gluteus Medius

Back 26

O = Ilium

I = Greater trochanter of femur

A = Abducts and medially rotates femur

Front 27

Internal Rotators

Back 27

O = Ilium, Ischium, and pubis

I = Greater trochanter of femur

A = Laterally rotates femur

Front 28

Psoas Major

Back 28

O = Transverse processes and bodies of lumbar vertebrae

I = Lesses trochanter of femur

A = Flexes vertebral column; flexes and laterally rotates femur

Front 29

Iliacus

Back 29

O = Iliac fossa

I = Tendon of psoas major

A = Flexes and laterally rotates femur

Front 30

Tensor Fascia Lata

Back 30

O = Iliac crest

I = Tibia via iliotibial tract

A = Flexes and abducts femur

Front 31

Sartorius

Back 31

O = Anterior superior iliac spine

I = Medial surface of body of tibia

A = Flexes leg; flexes and laterally rotates thigh (thus crossing leg)

Front 32

Rectus Femoris

Back 32

O = Anterior inferior iliac spine

I = Base of patella

A = Flexes thigh; extends leg

Front 33

Vastus Group: Lateralis, Medialis, Intermedius

Back 33

O = Femur

I =Tibial tuberosity via patellar ligament

A = Extends leg

Front 34

Gracilis

Back 34

O = Pubic symphysis and pubic arch

I = Medial surface of body of tibia

A = Adducts thigh; flexes leg

Front 35

Adductor Longus

Back 35

O = Pubic symphysis and pubic crest

I = Linea Aspera of femur

A = Adducts, flexes, and medially rotates thigh

Front 36

Pectineus

Back 36

O = Superior ramus of pubis

I = Pectineal line of femur

A = Flexes and adducts thigh

Front 37

Adductor Magnus

Back 37

O = Inferior ramus of pubis and ischial tuberosity

I = Linea aspera of femur

A = Adducts, flexes, extends and medially rotates thigh

Front 38

Biceps Femoris

Back 38

O = Ischial tuberosity and linea aspera of femur

I = Head of fibula; tibia

A = Flexes leg; extends thigh

Front 39

Semimembranosus

Back 39

O = Ischial tuberosity

I = Medial condyle of tibia

A = Flexes leg; extends thigh

Front 40

Semitendinosus

Back 40

O = Ischial tuberosity

I = Medial surface of tibia

A = Flexes leg; extends thigh

Front 41

Gastrocnemius

Back 41

O = Medial and lateral condyles of femur

I = Calcaneous via achilles tendon

A = Flexes leg; plantar flexes foot

Front 42

Soleus

Back 42

O = Tibia and Fibula

I = Calcaneus via achilles tendon

A = Plantar flexes foot