Eric M. Lassiter, Julia M Keating, Kristina Tarter, Kylie Saxton, Sanjana Yerubandi, Safa Habib, Brianna Bailey, Adel Maklad
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引用次数: 0
摘要
颈神经环(ansa cervicalis,AC)是颈前部颈动脉三角内的一个神经环。该神经环传统上由颈丛神经根 C1-C3 构成,并延伸出多个运动分支。本病例是在一次例行解剖中发现的,是一具 86 岁高加索男性尸体右侧 AC 的解剖变异。在这种变异中,C1 神经根没有与 C2 和 C3 神经根形成典型的环路,而是保持独立,深入到枕骨肌上腹部,供应胸甲肌。由于没有形成环路,因此本病例的解剖结构不属于ansa,根据该词的拉丁词源,ansa意为 "手柄 "或 "环"。AC 是颈部的一个重要解剖标志,与睡眠呼吸暂停患者的喉神经支配和呼吸神经刺激有关。目前的解剖变异只是相对有限的已识别异常目录的一部分。了解新的 AC 变异可以指导未来的手术干预,并进一步发展目前围绕头颈部神经肌肉结构的知识基础。
An Independent C1 Nerve Root Variant of the Ansa Cervicalis: A Case Report
The ansa cervicalis (AC) is a neural loop within the carotid triangle of the anterior neck. The loop is traditionally formed by nerve roots C1–C3 of the cervical plexus and extends multiple motor branches. The current case was discovered during a routine dissection as an anatomical variation of the right AC in an 86-year-old Caucasian male cadaver. In this variation, the C1 nerve root did not form the typical loop with the C2 and C3 nerve roots, but instead, remained independent, traveling deep to the superior belly of the omohyoid muscle to supply the sternothyroid muscle. Because no loop was formed, the anatomy of the current case was not an ansa according to the Latin origin of the word, meaning handle or loop. The AC is an important anatomical landmark within the neck and is implicated in laryngeal reinnervation and respiratory nerve stimulation for patients with sleep apnea. The current anatomical variant contributes to a relatively limited catalog of identified anomalies. Knowledge of new AC variations can guide future surgical interventions and further develop the current base of knowledge surrounding the neuromuscular structures of the head and neck.