Anatomic Snuff-Box

Kg.l0.13a,h. Radial artery. Transverse 15-7 MHz US images obtained a at the radial styloid and, more distally, b at the scaphoid bone level demonstrate the relationship of the radial artery (a) and veins (v) with the abductor poUicis longus (APL) and the extensor pollicis brevis (EPB) tendons. As the radial vessels proceed distally, they pass deep to the extensor tendons crossing the floor of the anatomic snuff-box to reach the dorsal aqtect of the hand. The inserts at the upper sides of the figure indicate prohe positioning... 

On gray-scale US images, the ulnar and radial arteries are readily visible because of their pulsatil-ity. The main landmark for the radial artery is the lateral aspect of the flexor carpi radialis while the ulnar artery passes medial to the flexor carpi ulnaris (Fig. 10.23). More distally, the radial artery moves in a lateral position within the subcutaneous tissue, between the skin and the superficial aspect of the pronator quadratus (Fig. 10.24a). As it approaches the distal radius, this artery deepens to pass on the dorsal aspect of the wrist, within the anatomic snuff-box. Its palmar branch can be imaged in the subcutaneous tissue as a small hypoechoic pulsatile structure. Variations in size of the palmar branch are common and this vessel may also appear as large as the radial artery. The ulnar artery can be found in... 

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