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Biceps brachii

The biceps brachii (also biceps brachii muscle, latin: biceps brachii) is a two-headed muscle located in the anterior region of the upper arm. It is the most promenent muscle on the anterior side of the upper arm.

The biceps brachii has two portions - a long and a short head.

Origin

The long head of the biceps brachii originates from the supraglenoid tubercle of the scapula, while the short head arises from the coracoid process of the scapula.

Insertion

Fibers of both heads of the biceps brachii merge together at the middle of the humerus and insert onto the radial tuberosity and the bicipital aponeurosis into the deep fascia on the medial part of the forearm.

Action

The main functions of biceps brachii are flexion and supination of the forearm. Fibers from the short head provide flexion of the upper arm, fibers from the long head provide abduction of the upper arm.

Innervation

The biceps brachii is innervated by the musculocutaneous nerve.