Deltoid branch of deep brachial artery

The deltoid branch of the deep brachial artery is a small arterial branch that arises from the deep brachial artery (arteria profunda brachii) in the upper arm. The deep brachial artery itself is the largest branch of the brachial artery, originating from its posterior aspect in the proximal arm.

Anatomical Course and Relations

The deep brachial artery travels posteriorly alongside the radial nerve through the radial (spiral) groove of the humerus, between the lateral and medial heads of the triceps brachii muscle. Along its course, it gives off several branches, including the deltoid branch.

The deltoid branch (also referred to as the ascending branch or deltoid ramus) courses superiorly and laterally to supply the:

• Deltoid muscle — contributing to its vascular supply, particularly its posterior portion

• Periosteum of the humerus in the region of the deltoid tuberosity

• Adjacent soft tissues of the lateral arm

Anastomotic Significance

This branch participates in important anastomotic networks around the shoulder and proximal arm. It anastomoses with the descending branch of the posterior circumflex humeral artery, forming part of the collateral arterial network that ensures blood supply to the deltoid region and proximal humerus. This anastomosis is clinically relevant in cases of brachial artery occlusion, as it can serve as a collateral pathway for maintaining distal perfusion.