Cheetham J, Radcliffe C R, Ducharme N G, Sanders I, Mu L, Hermanson J W
Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.
Equine Vet J. 2008 Jan;40(1):70-5. doi: 10.2746/042516407X240465.
Studies are required to define more accurately and completely the neuroanatomy of the equine dorsal cricoarytenoid muscle as a prerequisite for developing a neuroprosthesis for recurrent laryngeal neuropathy.
To describe the anatomy, innervation, fibre types and function of the equine dorsal cricoarytenoid muscle.
Thirty-one larynges were collected at necropsy from horses with no history of upper airway disease and 25 subjected to gross dissection. Thereafter, the following preparations were made on a subset of larynges: histochemical staining (n = 5), Sihler's and acetylcholinesterase staining for motor endplates (n = 2). An additional 6 larynges were collected and used for a muscle stimulation study.
Two neuromuscular compartments (NMC), each innervated by a primary nerve branch of the recurrent laryngeal nerve, were identified in all larynges. Stimulation of the lateral NMC produced more lateral displacement of the arytenoid cartilage than the medial NMC (P<0.05). The medial NMC tended to rotate the arytenoid cartilage dorsally. Motor endplates were identified at the junction of the middle and caudal thirds of each NMC. If fibre type grouping was present it was always present in both NMCs.
The equine dorsal cricoarytenoid muscle has 2 distinct muscle NMCs with discrete innervation and lines of action. The lateral NMC appears to have a larger role in increasing cross-sectional area of the rima glottidis.
This information should assist in planning surgical reinnervation procedures and development of a neuroprosthesis for recurrent laryngeal neuropathy.
需要进行研究以更准确、全面地定义马的环杓后肌的神经解剖结构，这是开发用于喉返神经病变的神经假体的前提条件。
描述马环杓后肌的解剖结构、神经支配、纤维类型和功能。
在尸检时收集31个无上部气道疾病病史的马的喉部，并对其中25个进行大体解剖。此后，对一部分喉部进行了以下准备工作：组织化学染色（n = 5）、用于运动终板的西勒氏染色和乙酰胆碱酯酶染色（n = 2）。另外收集了6个喉部用于肌肉刺激研究。
在所有喉部中均识别出两个神经肌肉区（NMC），每个区由喉返神经的一个主要神经分支支配。刺激外侧NMC比内侧NMC产生的杓状软骨外侧移位更多（P<0.05）。内侧NMC倾向于使杓状软骨背侧旋转。在每个NMC的中三分之一和尾三分之一交界处识别出运动终板。如果存在纤维类型分组，则在两个NMC中均始终存在。
马环杓后肌有两个不同的肌肉NMC，具有离散的神经支配和作用线。外侧NMC似乎在增加声门裂横截面积方面起更大作用。
这些信息应有助于规划手术再支配程序以及开发用于喉返神经病变的神经假体。
