Yildiz Selda, Yalcin Bulent
Department of Anatomy, Faculty of Medicine, Gulhane Military Medical Academy, Etlik, 06018, Ankara, Turkey.
Surg Radiol Anat. 2012 Sep;34(7):661-3. doi: 10.1007/s00276-011-0929-0. Epub 2012 Jan 6.
Peroneus tertius (fibularis tertius) is a muscle unique to humans. It often appears to be a part of extensor digitorum longus, and might be described as its "fifth tendon". Although its insertion variation has been reported by many authors, variations of its origin points are not common. A variation of the peroneus tertius muscle was found during routine dissection of a 75-year-old male cadaver. The muscle originated from the extensor hallucis longus. The muscle belly of the extensor hallucis longus arose from the middle two-fourths of the medial surface of the fibula, medial to the extensor digitorum longus, and anterior surface of the interosseous membrane. It lay under the extensor digitorum longus, and lateral to the tibialis anterior muscle. The muscle belly of the extensor hallucis longus divided into medial and lateral parts 17 cm below its origin point. The lateral part, named as peroneus tertius, continued downward to reach the medial part of the dorsal surface of the base of the fifth metatarsal bone. The medial part ran also downward and divided into two tendons reaching the dorsal surface of the base of the distal phalanx of the great toe. This kind of variation may be important during foot or leg surgery.
第三腓骨肌是人类特有的肌肉。它常看似是趾长伸肌的一部分，可能被描述为其“第五条肌腱”。尽管许多作者都报道过其止点变异，但起点变异并不常见。在对一具75岁男性尸体进行常规解剖时发现了第三腓骨肌的一种变异。该肌肉起自拇长伸肌。拇长伸肌的肌腹起自腓骨内侧表面中份的四分之二，在趾长伸肌的内侧，以及骨间膜的前面。它位于趾长伸肌下方，胫骨前肌外侧。拇长伸肌的肌腹在其起点下方17厘米处分为内侧和外侧部分。外侧部分，即第三腓骨肌，继续下行至第五跖骨基底背面的内侧部分。内侧部分也向下走行并分为两条肌腱，到达拇趾远节趾骨基底的背面。这种变异在足部或腿部手术中可能很重要。
