Biceps Brachii Muscle

Description, Attachments, Actions, Innervation, and Blood Supply

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 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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Flexion of the elbow

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Supination of the forearm

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Flexion of the shoulder

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Nerve Supply

a. Musculocutaneous nerve.

b. Nerve roots: C5, C6, and C7.

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Nerve Supply

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Nerve Roots

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Blood Supply

a. Brachial artery.

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Terms of Use

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References and 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“