Clinical anatomy of subcutaneous veins in the dorsum of the hand
Zhang Shaoxiang , Liu Zhengjin , Schmidt HM ( Department of Anatomy , The 3rd Military Medical University . Chongqing 630038)
Ninety adult upper extremities from human cadavers were used to study the patterns of the subcutaneous veins in the dorsum of the hands with careful dissection and measurement under mag- nification. In our series . the distribution of the veins was not symmetrical in the dorsum of the hand. In 83. 3%of the cases . the veins were arranged in two groups , radial and ulnar . above the transverse mid- line of the dorsum of the hand. The area between these two groups , corresponding to the proximal halves of the second metacarpal hone , the second intermetacarpal space and the third metacarpal bone , might be called vein lacking area' Crossing branches of the veins were found in all cases. There were on average three crossing branches in each case . and their internal diameters were 0. 9 ±0. 2mm. This study established that the subcutaneous veins in the dorsum of the hand are arranged in two layers apart from the two venous layer. in the skin and in company with the dorsal metacarpal arteries. They com- municate freely with the veins in the palmar aspect through intermetacarpal spaces. The average num- ber of porforating branchex was 3. 9 , and their internal diameters were 1 . 0±0. 4mm. The perforating branch in the first intermetacarpal space was wide (internal diameter , 1 . 8 ± 0. 3mm ) and very constant (appearance rate , 100% ). This branch may be the most important communication between the superfi- cial and deep veins We found the Venous valves in 70. 0% of the perforating branches , which prevent the blood flowing from the dorsum to the palm.
【CateGory Index】： R658.1