Reidenbach M M, Schmidt H M
Department of Anatomy, Rheinische Friedrich-Wilhelms-Universität Bonn, Germany.
Ann Anat. 1994 Jun;176(3):209-16. doi: 10.1016/s0940-9602(11)80480-2.
We studied the topography of the elbow region with special regard to the ulnar nerve during fetal life. Plastinated 600 microns thick sections through the right and left arms of ten fetuses with a crown-rump length (CRL) of 105 to 360 mm and of a newborn infant were investigated. The ulnar groove does not appear on the dorsal side of the medial humeral epicondyle earlier than at a crown-rump length of 130 mm. It provides the entrance into a formerly described fibro-osseous tunnel called the cubital tunnel. Its floor is formed by the posterior bundle of the ulnar collateral ligament, which bulges medially on flexion of the elbow joint. Up to 270 mm CRL it is composed of rather loosely arranged connective tissue fibres. Later on, its fibres are densely packed and show a parallel orientation. The ulnar nerve is pushed medially but remains behind the medial epicondyle. None of the specimens showed displacement to the anterior site of the elbow joint. An aponeurotic arch bridging the humerus and ulna and covering the ulnar nerve medially could not be identified. The findings in the newborn infant did not reveal any significant differences compared to the fetal specimens.
我们研究了胎儿期肘部区域的局部解剖结构，特别关注尺神经。对10例头臀长（CRL）为105至360毫米的胎儿以及1例新生儿的左右手臂制作了600微米厚的塑化切片进行研究。尺神经沟在肱骨内上髁背侧出现的时间不早于头臀长130毫米时。它通向一个先前描述的纤维骨性隧道，即肘管。其底部由尺侧副韧带后束形成，该束在肘关节屈曲时向内侧隆起。在头臀长达到270毫米之前，它由排列相当松散的结缔组织纤维组成。后来，其纤维紧密排列并呈平行方向。尺神经被推向内侧，但仍位于内上髁后方。没有标本显示尺神经向肘关节前方移位。未发现有腱膜弓横跨肱骨和尺骨并在内侧覆盖尺神经。与胎儿标本相比，新生儿标本的研究结果未显示出任何显著差异。
