Ulnar veins

Diagram of the veins of the upper limb, including the ulnar veins

The ulnar veins are venous structures located in the forearm. They are part of the venous system of the upper limb and play a crucial role in draining deoxygenated blood from the forearm and hand back towards the heart.

Anatomy

The ulnar veins are typically paired, meaning there are two veins running alongside each other. They accompany the ulnar artery and are situated on the medial side of the forearm. These veins are part of the deep veins of the upper limb and are located beneath the muscular layers of the forearm.

Course

The ulnar veins begin at the superficial palmar arch in the hand, where they receive blood from the digital veins of the fingers. They then travel proximally, running alongside the ulnar artery. As they ascend, they receive blood from various tributaries, including the anterior interosseous vein and the posterior interosseous vein.

Anatomical illustration showing the ulnar veins in relation to the ulnar artery

Termination

The ulnar veins continue to ascend the forearm and eventually join with the radial veins to form the brachial veins near the elbow. This confluence occurs at the level of the cubital fossa, a triangular area on the anterior aspect of the elbow.

Function

The primary function of the ulnar veins is to return deoxygenated blood from the forearm and hand to the heart. They work in conjunction with the superficial veins of the arm, such as the basilic vein and the cephalic vein, to ensure efficient venous return.

Clinical Significance

The ulnar veins, like other deep veins, can be involved in conditions such as deep vein thrombosis (DVT), although this is less common in the upper limb compared to the lower limb. In medical procedures, the ulnar veins may be accessed for venipuncture or the insertion of intravenous lines.

Cross-section of the forearm showing the ulnar veins

Related Structures

• Ulnar artery
• Radial veins
• Brachial veins
• Superficial palmar arch
• Cubital fossa

Related Pages

• Venous system
• Deep vein thrombosis
• Forearm
• Upper limb

Detailed view of the ulnar veins in the forearm