Department of Neurosurgery, Academic Clinical Hospital, Wrocław, Poland.
Adv Clin Exp Med. 2013 May-Jun;22(3):309-18.
The brachial plexus is an important part of peripheral nervous systems. The studies of variation of the brachial plexus and its parts in the prenatal period are extremely rare.
The goal of the study was to assess brachial plexus trunk variability and their divisions in human fetuses.
Examinations were carried out on a total of 220 brachial plexuses derived from 110 fetuses aged 4-7 months, including 50 females (45.45%) in a CRL range of 80-233 mm. The following methods were incorporated into the study: anthropological, dissection, digital image acquisition and statistical methods. Symmetry and sexual dimorphism was observed.
Trunk variations were observed in 12 (5.45%) plexus divisions as well as in 74 (33.6%) variants cases. Variants were equally common in both genders and on both sides of the body. Variants of individual trunks were of a similar percentage, usually an observed central trunk formed by nerve roots C7 and C8. Anterior division of the middle trunk (ADMT) was the most variable division, observed in 63 (28.63%) cases. There was no asymmetry and sexual dimorphism.
Trunk variants are rare and anomalies of divisions were observed in one-third of cases, regardless of the side of the body and sex. Brachial plexus variation recognition is important from a clinical point of view.
臂丛是周围神经系统的重要组成部分。在产前阶段研究臂丛及其各部分的变异极为罕见。
本研究旨在评估人胎儿臂丛干变异及其分支。
共检查了 110 名 4-7 个月大胎儿的 220 个臂丛，其中 50 名女性（45.45%）的 CRL 范围为 80-233mm。纳入研究的方法包括人类学、解剖学、数字图像采集和统计学方法。观察了对称性和性别二态性。
在 12 个（5.45%）神经丛分支和 74 个（33.6%）变体病例中观察到干变异。变体在两性和身体两侧同样常见。各个干的变体百分比相似，通常观察到由神经根 C7 和 C8 形成的中央干。中间干的前分支（ADMT）是最易变的分支，在 63 例（28.63%）中观察到。没有不对称和性别二态性。
干变异很少见，无论身体的哪一侧和性别如何，分支异常都占三分之一。从临床角度来看，识别臂丛变异很重要。
