7H. Muscles of the Upper Arm

These flashcards cover key muscles of the upper arm, their innervations, and related concepts from the lecture notes.

Pectoralis Major

A major muscle of the chest involved in shoulder flexion, adduction, and internal rotation.

Latissimus Dorsi

A large muscle of the back that helps in shoulder adduction, extension, and internal rotation.

Teres Major

A muscle that assists in shoulder adduction and internal rotation.

Deltoid

A muscle with three parts (anterior, middle, posterior) that primarily helps with shoulder abduction.

Coracobrachialis

A muscle that helps in flexing and adducting the arm at the shoulder.

Rotator Cuff Muscles

A group of four muscles that stabilize the shoulder joint: Subscapularis, Supraspinatus, Infraspinatus, Teres Minor.

Medial Pectoral Nerve

Innervates the pectoralis major and minor muscles.

Lateral Pectoral Nerve

Innervates the pectoralis major muscle.

Thoracodorsal Nerve

Innervates the latissimus dorsi muscle.

Supraspinatus

A rotator cuff muscle responsible for shoulder abduction.

Infraspinatus

A rotator cuff muscle that externally rotates the shoulder.

Teres Minor

A rotator cuff muscle involved in external rotation and adduction of the shoulder.

Rotator Cuff Tear

An injury affecting one of the rotator cuff muscles, often the supraspinatus.

Rotator Cuff Tendinosis

Degeneration of a rotator cuff tendon, often due to overuse.

Suprascapular Nerve

Innervates both the supraspinatus and infraspinatus muscles.

Axillary Nerve

Innervates the deltoid and teres minor muscles.

Dorsal Scapular Nerve

Innervates the rhomboids and levator scapulae muscles.

Musculocutaneous Nerve

Innervates the coracobrachialis, biceps brachii, and brachialis muscles.