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Muscles Upper Limb

Chest and arm

QuestionAnswer
O. of Pectoralis Major Clavicular head: medial half of clavicle. Sternal head: sternum, carilages of upper 6 ribs.
I. of Pectoralis Major Lateral lip of bicipital groove of humerus
A. of Pectoralis Major Adduction, horizontal adduction and medial rotation of humberus. Clavicular head: flexion of humerus. Sternal Head: extension of humerus from a flexed position
N. of Pectoralis Major Clavicular Head: lateral pectoral n. Sternal Head: medial pectoral n.
O. of Pectoralis Minor Anterior surface of ribs 3,4,5 near costal cartilage
I. of Pectoralis Minor Coracoid Process of scapula on medial border of superior surface
A. of Pectoralis Minor Protraction, depression, downward rotation of the scapula
N. of Pectoralis Minor Medial Pectoral n.
O. of Subclavius 1st rib costocartilage junction
I. of Subclavius Inferior shaft of clavicle- middle 1/3
A. of Subclavius Stabilizes clavicle by moving it medially
N. of Subclavius Nerve to Subclavius
O. of Serratus Anterior Outer surface of upper 8 ribs (by finger-like slips)
I. of Serratus Anterior Vertebral border of the scapula- anterior surface
A. of Serratus Anterior Protraction, upward rotation of scapula, stabilizes scapula against chest wall
N. of Serratus Anterior Long Thoracic n.
O. of Coracobrachialis Coracoid process of scapula
I. of Coracobrachialis Middle 1/3 of medial surface of humeral shaft
A. of Coracobrachialis Flexion, adduction of humerus
N. of Coracobrachialis Musculocutaneous n.
O. of Deltoids Anterior: lateral third of clavicle. Middle: lateral acromion. Posterior: spine of scapula
I. of Deltoids Deltoid tuberosity of humerus
A. of Deltoids Anterior: flexion, horizontal adduction, medial rotation of humerus. Middle: abduction of humerus to 90 degrees. Posterior: extension, horizontal abduction, lateral rotation of humerus.
N. of Deltoids Axillary n.
O. of Triceps Brachii Long Head: Infraglenoid tubercle of scapula. Lateral Head: Posterior humerus above the spiral groove. Medial head: posterior humerus below the spiral groove.
I. of Triceps Brachii Olecranon process of ulna
A. of Triceps Brachii Extension of elbow. Long Head: extension of humerus
N. of Triceps Brachii Radial n.
O. of Anconeus Lateral epicondyle of humerus
I. of Anconeus Olecranon process and upper posterior surface of ulna
A. of Anconeus Assists extension of elbow
N. of Anconeus Radial n.
O. of Brachialis Lower half of anterior shaft of humerus
I. of Brachialis Tuberosity of ulna, Coronoid process of ulna.
A. of Brachialis Flexion of elbow
N. of Brachialis Musculocutaneous n. (sometimes branches of radial and median nn.)
O. of Biceps Brachii Short head: coracoid process of scapula. Long head: Supraglenoid tubercle of scapula
I. of Biceps Brachii Tuberosity of radius, bicipital aponeurosis
A. of Biceps Brachii Flexion of elbow, supination of forearm. Short head: flexion of humerus
Created by: coyne44