Pai M M, Nayak S R, Vadgaonkar R, Ranade A V, Prabhu L V, Thomas M, Sugavasi R
Department of Anatomy, Centre for Basic Sciences, Kasturba Medical College, Bejai, Mangalore, Karnataka, India.
Morphologie. 2008 Mar;92(296):47-9. doi: 10.1016/j.morpho.2008.04.003. Epub 2008 May 19.
Variations of arm flexors are not uncommon with the exception of brachialis muscle. The role of brachialis is critical as it is the primary flexor of the elbow joint. Variations of brachialis are rare in literature. We present a case of an accessory-brachialis muscle (AcBr), found during routine cadaveric dissection. The AcBr originated from the lateral aspect of the brachialis muscle and lateral intermuscular septum. During its course towards the elbow, it crossed over the radial nerve and the distal tendon splits into two. The medial slip ran over the ulnar artery and merged with the deep fascia covering the pronator teres muscle, whereas lateral slip was inserted to the fascia covering the supinator. In the ipsilateral arm, an additional lateral cutaneous nerve of forearm (LCNF) was found coursing over the brachialis muscle medial to the LCNF. Clinical consideration of the present variations has been discussed. The present variation should be considered in the etiology of radial-tunnel syndrome (RTS).
除肱肌外，臂部屈肌的变异并不少见。肱肌的作用至关重要，因为它是肘关节的主要屈肌。肱肌的变异在文献中很少见。我们报告一例在常规尸体解剖中发现的副肱肌（AcBr）病例。副肱肌起源于肱肌外侧和外侧肌间隔。在其走向肘部的过程中，它跨过桡神经，远端肌腱分成两股。内侧束从尺动脉上方经过，与覆盖旋前圆肌的深筋膜融合，而外侧束则插入覆盖旋后肌的筋膜。在同侧手臂，发现一条额外的前臂外侧皮神经（LCNF）在肱肌上方向内侧走行于LCNF。本文已讨论了这些变异的临床意义。在桡管综合征（RTS）的病因学中应考虑到目前的变异情况。
