van Oudenaarde E, Oostendorp R
Department of Anatomy and Embryology, University of Nijmegen, The Netherlands.
J Anat. 1992 Aug;181 ( Pt 1)(Pt 1):155-9.
The abductor pollicis longus muscle (APL) can be separated into 2 divisions, deep and superficial. The deep division has more bellies, each of which has its own site of insertion. The superficial division is situated on top of the deep tendon. Each division is innervated by a separate branch of the radial nerve. This pattern of innervation may indicate independent actions by individual muscle parts. The deep division, inserting around the carpometacarpal joint of the thumb, has a nerve supply that reaches each separate muscle belly. This division should have a stabilising action on the joint. The superficial division, together with the extensor pollicis brevis, is innervated from the ulnar side by a terminal branch of the radial nerve. This division should, in cooperation with the extensor pollicis brevis and longus muscles and the thenar muscles, act to move the thumb in various directions.
拇长展肌（APL）可分为深、浅两个部分。深部有更多肌腹，每个肌腹都有自己的附着点。浅部位于深肌腱上方。每个部分由桡神经的一个单独分支支配。这种神经支配模式可能表明各个肌肉部分具有独立的功能。深部围绕拇指的腕掌关节附着，其神经供应到达每个单独的肌腹。该部分应对关节起到稳定作用。浅部与拇短伸肌一起，由桡神经的终末分支从尺侧支配。该部分应与拇短伸肌、拇长伸肌以及鱼际肌协同作用，使拇指向各个方向运动。
