Wk 2 Cadaver

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Platysma - pulls on skin of neck (elevates) to give expression of “horror” or “fright.” Depression of lower lip and angles of mouth

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Sternocleidomastoid - rotates head and neck while elevating chin (one side working) flexes head and neck (both sides working)

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Pectoralis Major

Clavicular portion - medial 2/.3 clavicle; Sternocostal portion - entire length of sternum and costal cartilages 1-6

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Pectoralis major - crest of the greater tubercle of humerus

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Pectoralis major - flexion of humerus (clavicular portion only), extension of humerus (sternocostal portion only, from flexed position), adduction of humerus, medial rotation of humerus at shoulder joint (both)

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Pectoralis Major - Medial pectoral nerve (sternocostal portion)(C7,C8,T1) and the Lateral Pectoral Nerve (clavicular portion)(C5, C6)

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Pectoralis major - pectoral branch of Thoracoacromial Trunk

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Pectoralis Minor - origin is ribs 3, 4, and 5

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Pectoralis minor - insertion is coracoid process of scapula

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Protraction, depression, downward rotation of scapula - Pectoralis minor

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Pectoralis Minor - medial pectoral nerve (C8, T1)

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Pectoralis minor - blood supply is the pectoral branch of the Thoracoacromial trunk

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Serratus Anterior - anterolateral surface of ribs 1-8

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Serratus Anterior - vertebral (medial) border of the scapula and the inferior angle of scapula

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Serratus Anterior - Protraction, upward rotation, depression of scapula

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Long Thoracic Nerve (C5, C6, C7)

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Serratus Anterior - Lateral Thoracic Artery

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Deltoid; Anterior, Lateral, and Posterior Deltoid; Origin of Anterior Deltoid - Lateral 1/3 of clavicle; Origin of Lateral Deltoid - acromion process of scapula; Origin of Posterior Deltoid - Spine of Scapula

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Deltoid - Deltoid Tuberosity of Humerus

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Deltoid; Anterior actions include flexion & medial rotation of the humerus; Lateral actions include abduction of humerus after the first 5-10 degrees; Posterior actions include extension & lateral rotation of the humerus

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Deltoid - Axillary Nerve (C5, C6)

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Deltoid - Deltoid branch of thoracoacromial artery and the anterior + posterior circumflex humeral artery

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Biceps Brachii - Short Head origin is the coracoid process of scapula and the Long head origin is the Supraglenoid tubercle of the scapula

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Biceps Brachii - Short head insertion is the radial tuberosity; Long head insertion is the bicipital aponeurosis

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Biceps Brachii - Short head action is forearm supination and the long head action is forearm flexion

Very weak role in shoulder flexion

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Biceps Brachii - musculocutaneous Nerve (C5, C6, C7)

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Biceps Brachii - Brachial Artery

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Coracobrachialis - coracoid process of scapula

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Coracobrachialis - medial surface of humerus (mid-shaft)

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Coracobrachialis - Flexion and adduction of humerus at the shoulder joint

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Coracobrachialis - Musculocutaneous nerve (C5, C6, C7)

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Coracobrachialis - Brachial artery + Anterior circumflex humeral artery

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Brachialis - flexes forearm

Name the rotator cuff muscles

1. Supraspinatus

2. Infraspinatus

3. Subscapularis

4. Teres minor

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Supraspinatus - originates at the supraspinous fossa of scapula

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Supraspinatus - inserts into the greater tubercle of humerus

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Supraspinatus - Abducts humerus at shoulder joint for the first 0-15 degrees

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Supraspinatus - Suprascapular nerve (C4, C5, C6)

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Supraspinatus - suprascapular artery

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Infraspinatus - originates at the infraspinous fossa of scapula

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Infraspinatus - inserts into the greater tubercle of humerus (just posterior to supraspinatus)

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Infraspinatus - lateral rotation of humerus at shoulder joint

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Infraspinatus - innervated by Suprascapular nerve (C5, C6)

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Infraspinatus - Suprascapular artery, subscapular artery and the circumflex scapular artery

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Teres Minor - originates at the upper 2/3 of axillary (lateral) border of scapula

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Teres minor - inserts into the greater tubercle of humerus (just posterior and inferior to infraspinatus)

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Teres minor - lateral rotation of humerus at shoulder joint

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Teres minor - axillary nerve (C5, C6)

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Teres minor - Subscapular artery and circumflex scapular artery

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Subscapularis - originates at the subscapular fossa of scapula

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Subscapularis - inserts into the lesser tubercle of humerus

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Subscapularis - medial rotation of humerus at shoulder joint

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Subscapularis - innervated by the upper and lower subscapular nerve (C5, C6, C7)

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Subscapularis - Subscapular artery

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Teres major - medial rotation, adduction of humerus at shoulder joint

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Triceps Brachii - Long head originates at the infraglenoid tubercle of scapula; Lateral head originates at the posterolateral surface of humerus above the radial groove; Medial head originates at the posteromedial surface of humerus below the radial groove

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Triceps brachii - olecranon process of ulna

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Triceps Brachii - extension of the forearm (all heads) at elbow joint - extension of humerus (long head) and adduction of humerus (long head) at the shoulder joint

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Triceps brachii - Radial nerve (C6, C7, C8)

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Triceps Brachii - Deep brachial artery and the posterior circumflex humeral artery