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20 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Coracobrachialis
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Orig: Tip of coracoid process
Ins: Middle of medial border of humerus |
Action: Flexes and adducts shoulder joint
N: Musculocutaneous n. (C5,6,7) |
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Biceps brachii
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Orig: LONG HEAD from supraglendoid tubercle of scapula
SHORT HEAD from tip of coracoid process Ins: Heads insert together on radial tuberosity, along with bicipital aponeurosis |
Action: Flexes shoulder joint (long head may assist with sbduction if the humerus is laterally rotated)
N: Musculocutaneous n. (C5,6) |
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Brachialis
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Orig: Lower half of front of humerus
Ins: Ulnar tuberosity, coronoid process of ulna |
Action: Flexes elbow
N: Musculocutaneous n. (C5,6) and radial n. (C7) to small lateral part |
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Triceps brachii
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Orig: LONG HEAD from infraglenoid tubercle of scapula
LATERAL HEAD from posterior and lateral surfaces of humerus above radial groove MEDIAL HEAD from posterior surface of humerus below radial groove Ins: All three heads insert together on upper surface of olecranon process of ulna and deep fascia of forearm. A few fibers insert into fibrous capsule of elbow joint |
Action: Extends elbow, Long head aids in extension and adduction of arm
N: Radial n. (C6,7,8) |
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Anconeus
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Orig: Posterior surface of lateral epicondyle of humerus
Ins: Lateral side of olecranon and upper fourth of posterior surface of shaft of ulna |
Action: assists triceps in extending elbow joint
N: Radial n. (C7,8) |
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Trapezius
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Orig: UPPER FIBERS from external occipital protuberance, medial 1/3 of superior nuchal line, ligamentum nuche, spine of C7
MIDDLE FIBERS from spines of T1-T5 LOWER FIBERS from spines of T6-T12 Ins: UPPER FIBERS into lateral third of clavicle MIDDLE FIBERS into acromion and crest of spine of scapula LOWER FIBERS into an aponeurosis at medial end of spine of scapula |
Action: UPPER FIBERS elevate, retract and rotate scapula upward. With insertion fixed, they extend, side bend to same side and rotate head to opp. side
MIDDLE FIBERS retract scapula LOWER FIBERS retract, depress and rotate scapula upward N: Spinal accessory n. (XI cranial n.) and ventral rami of C2,3,4 |
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Latissimus dorsi
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Orig: Spines of T7-T12, thoracolumbar fascia from lumbar and sacral spines and posterior third of iliac crest. Lower 3 or 4 ribs. A slip from inferior angle of scapula
Ins: Intertubercular groove of humerus (anterior) |
Action: extends, adducts and medially rotates humerus. With humerus stable, contraction of latissimus can raise the pelvis toward upper body (depressing shoulder girdle). Acting bilaterally, tilts pelvis anteriorly. Acting unilaterally, assists with lateral flexion on the trunk
N: Thoracodorsal n. (C6,7,8) from posterior cord of brachial plexus |
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Levator scapulae
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Orig: Transverse processes of first 4 cervical vertebrae
Ins: Medial border of scapula from superior angle to base of spine |
Action: Elevates and rotates scapula downwards. With insertion fixed, it extends, side bends and rotates neck to same side
N: Dorsal scapular n. (C5), ventral rami of C3,4 |
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Rhomboideus major
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Orig: Spines of T2-T5
Ins: Medial border of scapula from base of spine to inferior angle |
Action: Retract, elevate and rotate scapula downwards
N: Dorsal scapular n. (C4,5) |
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Romboideus minor
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Orig: Lower part of ligamentum nuchae, spines of C7 and T1
Ins: Medial border at base of spine |
Action: Retract, elevate and rotate scapula downwards
N: Dorsal scapular n. (C4,5) |
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Pectoralis major
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Orig: clavicular head from anterior surface of sternal half of clavicle
Sternocostal head from anterior surface of sternum and costal cartilages of first six or seven ribs Ins: Crest of greater tubercle of humerus |
Action: Both heads ADDUCT and MEDIALLY ROTATE humerus
Clavicular head FLEXES, HORIZONTALLY ADDUCTS, MEDIALLY ROTATES humerus Sternocostal head DEPRESSES shoulder girdle and obliquely ADDUCTS humerus toward opposite iliac crest N: Medial and lateral pectoral nerves (C5-T1) from medial and lateral cords |
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Pectoralis minor
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Orig: Upper margins and outer surfaces of ribs 2 or 3-5 near their cartilages
Ins: Medial border and upper surface of coracoid process of scapula |
Action: With origin fixed, ANTERIOR SCAPULAR TILT
Assists in forced inspiration N: Medial pectoral n. with fibers from lateral pectoral n. (C6,7,8,T1) |
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Subclavius
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Orig: Upper surface of first rib and its costal cartilage and their junction
Ins: Lower surface of middle third of clavicle |
Action: Probably pulls clavicle downwards and forwards and stabilizes it during movements of shoulder
N: Nerve to subclavius (C5,6) from upper trunk of brachial plexus |
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Serratus anterior
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Orig: Digitations from outer surfaces and upper borders of upper 8 or 9 ribs on anterolateral thoracic wall
Ins: Entire length of costal surface of medial border of scapula from superior to inferior angles |
Action: Principal protractor of scapula
Chief muscle in all reaching and pushing movements Lower fibers rotate scapula upwards (may depress) N: Long thoracic n. (C5,6,7) from roots of brachial plexus |
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Deltoid
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Orig: Anterior fibers from lateral third of clavicle (anterior border and superior surface)
Middle fibers from acromion (lateral margin and superior surface) Posterior fibers from lower edge of crest of spine of scapula Ins: Deltoid tuberosity of humerus on anterolateral surface just above its midshaft |
Action: Middle fibers are principal ABDUCTOR of humerus
Anterior fibers FLEX and MEDIALLY ROTATE humerus Posterior fibers EXTEND and LATERALLY ROTATE humerus N: Axillary N. (C5-6) from posterior cord |
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Supraspinatus
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Orig: Medial 2/3 of supraspinous fossa of scapula
Ins: Superior face on greater tubercle of humerus |
Action: Assists deltoid in abduction of humerus
N: Suprascapular n. (C4-6) from upper trunk |
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Infraspinatus
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Orig: medial 2/3 of infraspinous fossa of scapula
Ins: middle facet on greater tubercle of humerus |
Action: Principal lateral rotator of humerus
N: Suprascapular n. (C5-6) |
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Teres minor
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Orig: upper 2/3 of dorsal surface of lateral border of scapula
Ins: Lowest facet on greater tubercle of humerus |
Action: LATERAL ROTATION of humerus
N: Upper and lower subscapular nerves (C5-6) |
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Subscapularis
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Orig: medial 2/3 of subscapular fossa on costal surface of scapula
Ins: Lesser tubercle of humerus |
Action: Principal MEDIAL ROTATOR of humerus
N: Upper and lower subscapular n. from posterior cord |
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Teres major
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Orig: Dorsal surfaces of inferior angle and lower third of lateral border of scapula
Ins: Crest of lesser tubercle of humerus |
Action: EXTENDS, MEDIALLY ROTATES and ADDUCTS humerus
N: Lower subscapular n. (C5-7) from posterior cord |
