Skip to main content

Unfortunately we don't fully support your browser. If you have the option to, please upgrade to a newer version or use Mozilla Firefox, Microsoft Edge, Google Chrome, or Safari 14 or newer. If you are unable to, and need support, please send us your feedback.

Publish with us
Muscular Branch of Radial Nerve to Brachioradialis (Left)
Nervous System

Muscular Branch of Radial Nerve to Brachioradialis (Left)

Ramus musculi brachioradialis nervi radialis

Read more


A motor nerve branch to brachioradialis muscle originates from the radial nerve and contains motor nerve fibers from the C5—C6 cervical spinal segments.


In the upper part of the arm, it descends posterolaterally (with the profunda brachii vessels) through the lower triangular space, between the shaft of the humerus, long head of triceps brachii, and teres major muscles. The nerve then enters the radial groove along with the profunda brachii vessels. It descends downwards and laterally between the lateral and medial heads of the triceps muscle, while in contact with the humerus.

In the lower part of the arm, it pierces the lateral intermuscular septum and passes into the anterior compartment of the arm to reach the cubital fossa where it lies between the brachialis muscle medially and brachioradialis and extensor carpi radialis longus muscles laterally. The radial nerve then passes deep to the brachioradialis muscle in the posterior compartment of the forearm and gives off a branch to the muscle before splitting into its superficial and deep terminal branches.


There are no named branches.

Supplied Structures

The muscular branch of the radial nerve to brachioradialis provides motor innervation to the brachioradialis muscle.

List of Clinical Correlates

—Inverted brachioradialis (inverted supinator) reflex (McGee, 2016)


McGee, S. (2016) Evidence-Based Physical Diagnosis E-Book. Elsevier Health Sciences.

Learn more about this topic from other Elsevier products

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).

Explore on ScienceDirect(opens in new tab/window)

Complete Anatomy

The world's most advanced 3D anatomy platform

Complete Anatomy