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.

    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.