Kamali Younes
Department of Basic Sciences, Anatomy and Embryology Division, School of Veterinary Medicine, Shiraz University, Shiraz, Iran.
Anat Histol Embryol. 2022 May;51(3):419-423. doi: 10.1111/ahe.12792. Epub 2022 Feb 14.
In the left thoracic limb of a male cadaver (adult mixed-breed dog), the median nerve (MN) after departing from the common median/ulnar nerve (UN) trunk received two branches. One from the lateral thoracic nerve (LTN) and the other from the musculocutaneous nerve (MCN). These both passed cranial to the axillary artery at the level of the lateral thoracic artery and joined the median nerve. Thus, in the proximal brachium, the axillary artery was cradled by this union, similar to the ansa axillaris of large animals and similar formations reported in human and non-human primates. In the distal brachium, the communicating branch ran unusually from the MN to the MCN on the left, and in both directions on the right. Awareness of such anatomical variations of the terminal branches of the brachial plexus (BP) in addition to the embryonic and evolutionary aspects can be useful in explaining neuroarterial signs with unknown origin, as those reported in human medicine.
在一只成年杂种雄性犬尸体的左前肢中，正中神经（MN）从正中/尺总神经（UN）干分出后接受了两个分支。一个来自胸外侧神经（LTN），另一个来自肌皮神经（MCN）。这两个分支均在胸外侧动脉水平经腋动脉前方并汇入正中神经。因此，在臂近端，腋动脉被这一联合结构包绕，类似于大型动物的腋袢以及人类和非人类灵长类动物中报道的类似结构。在臂远端，交通支在左侧异常地从正中神经延伸至肌皮神经，在右侧则双向延伸。除了胚胎学和进化方面，了解臂丛神经（BP）终末分支的这种解剖变异，有助于解释如人类医学中报道的不明原因的神经动脉体征。
