Lama Polly, Potu Bhagath K, Bhat Kumar Mr
Department of Anatomy, Sikkim Manipal University, Gangtok, Sikkim, India.
Cases J. 2009 Dec 2;2:9130. doi: 10.1186/1757-1626-2-9130.
Ulnar nerve is a branch of the brachial plexus. In the front of the forearm, normally near the wrist joint, it gives a dorsal cutaneous branch which supplies the skin of the dorsum of the hand.
The present case reports a very rare finding, the dorsal branch of the ulnar nerve along with the main nerve trunk originated between the two heads of the flexor carpi ulnaris muscle, after descending along the medial border of the forearm extensor surface, on the dorsal aspect of the wrist it is divided into three branches, one medial and two lateral. The medial most division received a communicating branch from the superficial ramus of the ulnar nerve and continued as the medial proper digital nerve of the little finger. The lateral two divisions became cutaneous on the medial half of the dorsum of the hand along the medial three digits i.e. radial and ulnar side of little, ring and middle finger.
The site, extent of injury, variations and the delay in the treatment, significantly influences the outcome of ulnar nerve repair. Thus, an adequate knowledge of all possible variations in the ulnar nerve may be important for clinicians and may help to explain uncommon symptoms.
尺神经是臂丛神经的一个分支。在前臂前部，通常靠近腕关节处，它发出一支手背皮支，供应手背皮肤。
本病例报告了一个非常罕见的发现，尺神经的背支与主干一起起源于尺侧腕屈肌两头之间，沿前臂伸侧内缘下行后，在腕背侧分为三支，一支在内侧，两支在外侧。最内侧的分支接受来自尺神经浅支的交通支，并延续为小指的尺侧固有指神经。外侧的两支在沿内侧三个手指（即小指、环指和中指的桡侧和尺侧）的手背内侧半变为皮支。
损伤的部位、范围、变异以及治疗延迟，均会显著影响尺神经修复的结果。因此，充分了解尺神经所有可能的变异情况，对临床医生可能很重要，且有助于解释不常见的症状。
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