Abstract
Background: Sural nerve is formed by communication of medial sural cutaneous nerve, that arise from tibial nerve in popliteal fossa and peroneal communicating nerve, a branch directly from common peroneal nerve or from lateral sural cutaneous nerve.The objective of this study was described an unusual and few reported anatomical variation in formation of sural nerve.
 Materials and Methods: The anatomical variation described was found during routine dissection performed by medical students of second semester in two maleembalbed adult cadavers of 75 and 65 years of age, respectivelyin the laboratory of Morphology of the University of Pamplona.
 Results and Discussion: In the left lower limb, both medial sural cutaneous nerve, and lateral sural cutaneous nervewere absent. The sural nerve arose directly from the tibial nerve. It’s observed a communicating branch between tibial nerve and common peroneal nerve. In the right lower limb, lateral sural cutaneous nerve was absent. The sural nerve arose directly from the common peroneal nerve.Peroneal communicating nerve was considered as absent in the two cases.Motor fiber from sural nerve to gastrocnemius muscle was observed in both lower limbs
 Conclusions:The knowledge of the sural nerve (normal anatomy and variations in origin and course) is important in evaluating of the patients, as well explaining the different clinical findings necessary for accuracy treatment.
 Bangladesh Journal of Medical Science Vol.18(3) 2019 p.508-512
Highlights
The sural nerve (SN) is clinically important, as it is commonly used for nerve conduction studies, nerve biopsies, and as a convenient source for nerve grafting
It is usually joined by the peroneal communicating nerve which is a branch of common peroneal nerve (CPN)
The sural nerve is one of the most commonly examinednerves by nerve conduction studies, mainly for the diagnosis of polyneuropathy, but it is useful in the evaluation of focal nerveinjury of the lumbosacral plexus and the sciatic and tibial nerves
Summary
The sural nerve (SN) is clinically important, as it is commonly used for nerve conduction studies, nerve biopsies, and as a convenient source for nerve grafting. The sural nerve is a branch from tibial nerve (TN) in the popliteal fossa, descends between the two heads of the gastrocnemius muscle, and pierces the deep fascia in the middle third of the posterior surface of the leg. The trunk was located at a mean distance of 13,5 mm, posterior and 13,5 mm inferior to the tip of the malleolus along the “malleolar line” (a vertical line parallel to the fibular shaft and through the tip of themalleolus) Along this line, the sural nerve was commonly situated superficial and slightly inferior to theperoneal tendons.Motor fiber from SN to GM was observed in both lower limbs
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