Yoshida Y
Department of Anatomy, Aichi Medical University, Japan.
Okajimas Folia Anat Jpn. 1995 Mar;71(6):355-63. doi: 10.2535/ofaj1936.71.6_355.
Anatomical studies on the extensor pollicis et indicis accessorius and extensor indicis radialis muscles were conducted on 952 upper limbs from 476 Japanese adult cadavers. Each anomalous muscle occurred between the extensor pollicis longus proprius and extensor indicis proprius muscles in the dorsum of the forearm and hand. The extensor pollicis et indicis accessorius muscle was present in 13 of the limbs (1.4%). It was not coexistent with another anomalous muscle of the extensor digitorum profundus mass in 9 cases, and it was coexistent with that muscle in 4. The extensor indicis radialis muscle was present in 34 limbs (3.6%). It was accompanied by another anomaly of the extensor digitorum profundus mass in 5 cases, and not accompanied by that muscle in 29. The extensor pollicis et indicis accessorius and extensor indicis radialis muscles were innervated by the posterior interosseus nerve of the radial nerve. It seems that the former anomalous muscle supplies the extensor control of the thumb and index finger, and the latter one of the index finger only. Each anomalous muscle was considered to be differentiating on the radial side of the extensor digitorum profundus mass in humans.
对来自476具日本成年尸体的952条上肢进行了拇长伸肌副肌和桡侧示指伸肌的解剖学研究。每块异常肌肉均出现在前臂和手部背侧的拇长伸肌和示指固有伸肌之间。拇长伸肌副肌在13条肢体中出现（1.4%）。其中9例未与指深屈肌团的另一异常肌肉并存，4例并存。桡侧示指伸肌在34条肢体中出现（3.6%）。其中5例伴有指深屈肌团的另一异常，29例未伴有该肌肉。拇长伸肌副肌和桡侧示指伸肌由桡神经骨间后神经支配。似乎前一块异常肌肉提供拇指和示指的伸肌控制，而后一块仅提供示指的伸肌控制。每块异常肌肉被认为是在人类指深屈肌团的桡侧分化而来。
