Abstract：
OBJECTIVE: The brachioradialis muscle (BRM) belongs to the lateral group of forearm muscles and contributes to the elbow flexion. Accessory brachioradialis muscle (ABRM) or \"brachioradialis accessorius\" represents an uncommon BRM variant, not been enough studied. The present study investigates the prevalence of the ABRM, along with its origin, insertion, and innervation.
METHODS: Eighty-three upper limbs were meticulously dissected at the arm, forearm, and cubital fossa to investigate the ABRM presence. When the variant muscle was identified, morphometric measurements were obtained.
RESULTS: The ABRM was identified in two upper limbs (2/83, 2.4%), in a male cadaver, bilaterally. Its origin was located along with the typical BRM, and its insertion was identified into the anterior surface of the radius (proximal third). The ABRM was innervated by the radial nerve, coursing posteriorly (deeply).
CONCLUSIONS: In the current study, the variant muscle was observed in 2.4%. Radial nerve compression, at the forearm, is not an uncommon entrapment neuropathy. The relationship between the radial nerve and the ABRM could precipitate radial neuropathy.
METHODS: Eighty-three upper limbs were meticulously dissected at the arm, forearm, and cubital fossa to investigate the ABRM presence. When the variant muscle was identified, morphometric measurements were obtained.
RESULTS: The ABRM was identified in two upper limbs (2/83, 2.4%), in a male cadaver, bilaterally. Its origin was located along with the typical BRM, and its insertion was identified into the anterior surface of the radius (proximal third). The ABRM was innervated by the radial nerve, coursing posteriorly (deeply).
CONCLUSIONS: In the current study, the variant muscle was observed in 2.4%. Radial nerve compression, at the forearm, is not an uncommon entrapment neuropathy. The relationship between the radial nerve and the ABRM could precipitate radial neuropathy.
摘要：
目的：臂拉肌（BRM）属于前臂肌肉的外侧组，有助于肘部屈曲。副臂交叉肌(ABRM)或“臂交叉肌”代表不常见的BRM变异体,没有得到足够的研究。本研究调查了ABRM的患病率，连同它的起源，插入,和神经支配。
方法：在手臂上精心解剖了83条上肢，前臂,和肘窝调查ABRM的存在。当识别出变异肌肉时，获得了形态测量。
结果：在两个上肢中发现了ABRM（2/83，2.4％），在一具男性尸体上，双边。它的起源位于典型的BRM，并确定其插入桡骨的前表面（近端三分之一）。ABRM受桡神经支配，向后（深）。
结论：在当前的研究中，在2.4%中观察到变异肌肉。桡神经压迫,在前臂，并不是一种罕见的压迫性神经病.radial神经与ABRM之间的关系可能会导致radial神经病变。
方法：在手臂上精心解剖了83条上肢，前臂,和肘窝调查ABRM的存在。当识别出变异肌肉时，获得了形态测量。
结果：在两个上肢中发现了ABRM（2/83，2.4％），在一具男性尸体上，双边。它的起源位于典型的BRM，并确定其插入桡骨的前表面（近端三分之一）。ABRM受桡神经支配，向后（深）。
结论：在当前的研究中，在2.4%中观察到变异肌肉。桡神经压迫,在前臂，并不是一种罕见的压迫性神经病.radial神经与ABRM之间的关系可能会导致radial神经病变。
