Kamaşak Arpaçay Burcu, Uğuz Emre, Ulcay Tufan, Aycan Kenan
Department of Anatomy, Faculty of Medicine, Kırşehir Ahi Evran University, Bagbasi, Şht. Sahir Kurutoğlu Street, No:100, Kırşehir, 40100, Turkey.
Surg Radiol Anat. 2025 May 24;47(1):143. doi: 10.1007/s00276-025-03633-9.
Both the extensor digitorum longus (EDL) and fibularis tertius (FT) muscles exhibit a wide range of morphological variations.
A 70-year-old male cadaver was subjected to routine anatomical dissection for research and teaching purposes.
The EDL had a markedly smaller fleshy belly, whereas the FT appeared hypertrophic. The EDL tendon displayed an atypical elongation and bifurcated into only three distinct slips, which inserted into the dorsal digital expansions of the second, third, and fourth toes. In contrast, the FT tendon was remarkably well-developed and divided into two slips. The lateral slip attached to the dorsal aspect of the base of the fifth metatarsal, while the medial slip extended distally to integrate into the dorsal digital expansion of the fifth toe.
In injuries involving tendon incisions, clinicians should consider EDL variations to ensure proper tendon restoration. The FT muscle flap and tendon grafts are commonly used to correct ankle joint laxity and foot drop. Understanding variations in the EDL and FT is crucial for surgical planning.
趾长伸肌（EDL）和第三腓骨肌（FT）均表现出广泛的形态变异。
为了研究和教学目的，对一具70岁男性尸体进行常规解剖。
EDL的肌腹明显较小，而FT显得肥大。EDL肌腱表现出非典型的延长，仅分成三条明显的腱束，插入第二、第三和第四趾的背侧指扩张部。相比之下，FT肌腱发育非常良好，分成两条腱束。外侧腱束附着于第五跖骨基底的背侧，而内侧腱束向远端延伸，融入第五趾的背侧指扩张部。
在涉及肌腱切开的损伤中，临床医生应考虑EDL的变异情况，以确保肌腱的正确修复。FT肌瓣和肌腱移植常用于纠正踝关节松弛和足下垂。了解EDL和FT的变异情况对于手术规划至关重要。
