Biceps Brachii

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Description

commonly known as the biceps, is a two-headed muscle that lies on the upper arm between the shoulder and the elbow.

Origin

Origin of Short Head: Apex of the coracoid process of

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 the scapula.

Origin of Long Head: Supraglenoid tubercle of the scapula.

Insertion

Tuberosity of the radius and aponeurosis of the biceps brachii (lacertus fibrosus).

Nerve

Musculocutaneous C5, 6.

Artery

Muscular branches of brachial artery

Function

Flexes the shoulder joint. The short head assists with shoulder adduction. The long head may assist with abduction if the humerus is laterally rotated. With the origin fixed, flexes the elbow joint, moving the forearm toward the humerus and supinates the forearm. With the insertion fixed, flexes the elbow joint, moving the humerus toward the forearm, as in pull-up or chinning
exercises.

Resources