Bilateral additional slips of triceps brachii forming osseo-musculo-fibrous tunnels for ulnar nerves.
Bilateral additional slips of triceps brachii forming osseo-musculo-fibrous tunnels for ulnar nerves.
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DOI：
10.4103/2141-9248.117931
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发表时间：
2013-07
影响因子：
--
通讯作者：
Pamidi N
中科院分区：
文献类型：
--
作者：
Swamy R;Rao M;Somayaji S;Raghu J;Pamidi N
在印度马尼帕尔马尼帕尔大学马六甲-马尼帕尔医学院为本科生进行上肢常规解剖时，在一名62岁南印度男性尸体中发现了罕见的肱三头肌双侧滑移。在左侧，变异体附加肌滑移起源于内侧肌间隔下部，距内侧肱骨上髁近4 cm。从它的起源，肌纤维穿过尺神经并与肱三头肌连接并插入尺骨鹰嘴突的上表面。在右侧，额外的肌肉滑移更大、更笨重，起源于肱骨内侧边界下部，距内侧上髁近4厘米，并附着于内侧肌间隔。在两侧，额外的滑脱由桡神经的细枝提供。在两侧，尺神经在骨-肌-纤维隧道中穿过变异附加滑脱和肱骨轴下部之间。这种异型附加肌滑移可能影响肱三头肌的功能，导致肱三头肌内侧头和内侧上髁上的尺神经断裂，也可能在肱三头肌收缩时动态压迫尺神经，导致肘部周围尺神经病变。
Rare additional slips of triceps brachii muscle was found bilaterally in a sixty two year old South Indian male cadaver during routine dissection of upper limb for undergraduate students at Melaka-Manipal Medical College, Manipal University, Manipal, India. On left side, the variant additional muscle slip took origin from the lower part of the medial intermuscular septum about 4 cm proximal to the medial humeral epicondyle. From its origin, the muscle fibres were passing over the ulnar nerve and were joining the triceps muscle to get inserted to the upper surface of olecranon process of ulna. On right side, the additional muscle slip was larger and bulkier and was arising from the lower part of the medial border of the humerus about 4 cm proximal to the medial epicondyle in addition to its attachment to the medial intermuscular septum. On both sides, the additional slips were supplied by twigs from the radial nerve. On both sides, the ulnar nerve was passing between variant additional slip and the lower part of the shaft of the humerus in an osseo-musculo-fibrous tunnel. Such variant additional muscle slips may affect the function of triceps muscle and can lead to snapping of medial head of triceps and ulnar nerve over medial epicondyle and also can dynamically compress the ulnar nerve during the contraction of triceps leading to ulnar neuropathy around the elbow.