Biceps Brachii: Origin, Insertion, Nerve supply & Action

Biceps Brachii: Biceps Brachii is a two-headed muscle. The majority of the muscle mass is located anteriorly to the humerus, it has no annexation(attachment) to the bone itself.biceps brachii muscleThe tendon of biceps brachii enters the forearm, a connective tissue sheet is given off – the bicipital aponeurosis. This forms(bicipital aponeurosis) the roof of the cubital fossa and coalesces with the deep fascia of the anterior forearm.

Attachments of the Biceps Brachii Muscle

Origin:

Long head of the Biceps originates from the supraglenoid tubercle of the scapula

Short head of the Biceps originates from the coracoid process of the scapula

Insertion:

Both heads of the Biceps insert distally into the radial tuberosity

 

Actions of the Biceps Muscle

Supination of the forearm.

It also flexes the arm at the elbow and at the shoulder.

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Nerve supply of the Biceps Muscle:

Musculocutaneous nerve. The bicep tendon reflex tests spinal cord segment C6.