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Radial Collateral Artery
Cardiovascular System

Radial Collateral Artery

Arteria collateralis radialis

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Quick Facts

Origin: Deep brachial artery.

Course: Distally in the posterior compartment of the arm.

Branches: No named branches.

Supplied Structures: Brachialis and brachioradialis muscles, the radial nerve, cutaneous supply to the lateral aspect of the arm.

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The terminal branches of the deep brachial artery are the larger middle collateral artery and the smaller radial collateral artery.


Proximally, the radial collateral artery lies with the radial artery on the posterior surface of the humerus. As it courses distally, it sits between the brachialis and brachioradialis muscles. It courses to the distal aspect of the lateral epicondyle of the humerus (Standring, 2016).


The radial collateral artery gives off muscular branches to the brachialis and brachioradialis muscle and forms an anastomosis with the radial recurrent artery.

Supplied Structures

The radial collateral artery contributes to the supply of the brachialis and the brachioradialis muscles, as well as the radial nerve. It also cutaneous supply to the lateral aspect of the arm.


Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series 41st edn.: Elsevier Limited.

Learn more about this topic from other Elsevier products


ScienceDirect image

When the artery is occluded blood is forced through the collateral vessels, drastically increasing fluid shear stress and triggering an inflammatory response which drives vessel remodeling.

Explore on ScienceDirect(opens in new tab/window)

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