Biceps Brachii Muscle
(Sample Lesson)
Muscle Description
The biceps brachii ( L., musculus biceps brachii ) is a large muscle that lies on the front of the upper arm between the shoulder and the elbow. It has two heads that both arise on the scapula and join to form a single muscle belly, which attaches to the upper forearm. While the biceps brachii muscle crosses both the shoulder and elbow joints, its primary function is at the elbow, where it flexes the forearm and supinates the forearm.
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Origin ( )
a. Long head: the supraglenoid tubercle of the scapula via a tendon that passes through the intertubercular groove of the humerus.
b. Short head: coracoid process of the scapula.
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Insertion ( )
a. Radial tuberosity.
b. Bicipital aponeurosis into deep fascia on the medial part of the forearm.
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Actions
a. Flexes the elbow (at the humeroulnar joint).
b. Supinates the forearm (at the radioulnar joint).
c. Flexes the shoulder (at the glenohumeral joint).
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Nerve Supply
a. Musculocutaneous nerve.
b. Nerve roots: C5, C6, and C7.
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Blood Supply
a. Brachial artery.
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Page Attributions
OpenStax, Anatomy and Physiology
Access for free at – https://openstax.org/books/anatomy-and-physiology/pages/1-introduction
Reference: “Muscles of the Pectoral Girdle and Upper Limbs“
Wikipedia, the free encyclopedia.
Reference: “Biceps“