Nayak Soubhagya R, Madhan Kumar S J, Krishnamurthy Ashwin, Prabhu Latha V, Ranade Anu Vinod, Rai Rajalakshmi, Ramanathan Lakshmi
Department of Anatomy, Centre for Basic Sciences, Kasturba Medical College, Bejai, Mangalore 575004, Karnataka, India.
Ann Anat. 2007;189(3):283-6. doi: 10.1016/j.aanat.2006.10.005.
The knowledge of anatomical variations in the antebrachial and dorsal regions of the arm and hand are useful in hand surgery. The extensor carpi radialis intermedius and extensor carpi radialis accessorius are two classic variants described for the radial wrist extensors, in the antebrachial region. We report an additional extensor carpi radialis muscle taking origin from the common extensor origin, between the extensor carpi radialis longus and extensor digitorum communis. The tendon of the variant muscle divides below the abductor pollicis longus and becomes attached to the base of the second and third metacarpal bone. Due to its considerable size and independent origin from the lateral epicondyle, we suggest the present variation should be named extensor carpi radialis tertius. The clinical significance of the present variation is discussed.
了解手臂和手部前臂及背部区域的解剖变异对手外科手术很有用。桡侧腕伸肌中间肌和桡侧腕副伸肌是前臂区域桡侧腕伸肌描述的两种经典变异。我们报告了另一块桡侧腕伸肌，它起自桡侧腕长伸肌和指总伸肌之间的伸肌总起点。变异肌肉的肌腱在拇长展肌下方分开，附着于第二和第三掌骨基部。由于其尺寸可观且独立起自外侧髁，我们建议将这种变异命名为桡侧腕第三伸肌。本文讨论了这种变异的临床意义。
