Muscular Branch of Radial Nerve to Extensor Carpi Radialis Brevis (Left)
Ramus musculi radialis brevi extensoris carpi nervi radialis
Read moreQuick Facts
Origin: Deep branch of radial nerve (C7—C8).
Course: Descends and emerges distally from the supinator muscle.
Branches: None.
Supply: Extensor carpi radialis brevis muscle.
Related parts of the anatomy
Origin
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.
Course
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.
Branches
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.
Learn more about this topic from other Elsevier products
Radial Nerve
The superficial radial nerve (SRN) is easily identified in the subcutaneous tissue above as it sweeps downward, crossing the fascia below (Figure 32.6).
