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Muscular Branch of Radial Nerve to Extensor Carpi Radialis Brevis (Left)
Nervous System

Muscular Branch of Radial Nerve to Extensor Carpi Radialis Brevis (Left)

Ramus musculi radialis brevi extensoris carpi nervi radialis

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A motor nerve branch to extensor carpi radialis brevis muscle originates from the deep branch of radial nerve. It contains motor nerve fibers from the C7—C8 cervical spinal segments.


The deep branch is a terminal branch of radial nerve given off in the cubital fossa, at the level of the lateral epicondyle of the humerus. The nerve leaves the cubital fossa and enters the back of the forearm by passing between the two planes of fibers of the supinator muscle. Before piercing the supinator, branches are given to the brachioradialis, extensor carpi radialis longus and brevis, and the supinator.


There are no named branches.

Supplied Structures

The muscle branch of radial nerve to extensor carpi radialis brevis provides motor innervation to the extensor carpi radialis brevis muscle.

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Radial Nerve

ScienceDirect image

The superficial radial nerve (SRN) is easily identified in the subcutaneous tissue above as it sweeps downward, crossing the fascia below (Figure 32.6).

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