Morphometric study of sciatic nerve and its topographic anatomical variations in relation to landmark structures around pelvis: a Nigerian population study
Loading...
Date
2020
Authors
Mbaka, G
Osinubi, A
Journal Title
Journal ISSN
Volume Title
Publisher
Folia Morphol (Warsz)
Abstract
Background: Sciatic nerve presents significant variations that pertain to its topography and divisions. The topographic variation shows sex effect due to differences in the dimension of pelvis that makes for the adaptability of female pelvis for pregnancy and childbirth. The objective therefore was to evaluate the sciatic nerve morphology and its topographical variations in relation to landmark structures in the pelvis of both sexes.
Materials and methods: Ninety-eight lower limb adult cadavers, sixty-six males and thirty- two females devoid of any gross pathology from Nigerian were used for the study. The cadavers were dissected to expose the sciatic nerves and the variations recorded. Anthropological measurements were taken and analysed using a Spearman’s rank-order correlation model.
Results and Conclusions: The relationships between sciatic nerve and the piriformis muscle shows five varied types with the typical type comprising 83.0%. The largest thickness of SN in males and females were 18.5 cm and 17.3 cm respectively while the smallest thickness were 8.6 cm and 11.9 cm respectively. The dimensions between posterior superior iliac spine and greater trochanter (PSIS-GT) and between lateral edges of sciatic nerve intersection with
piriformis to the tip of greater trochanter (LESN-GT) shows inverse correlation relationship between the two sexes. In males, there was a weak positive correlation (rs = 0.165) between LESN-GT (4.75 ± 1.52) and PSIS-GT (15.3 ± 2.90) which was not statistically significant at 0.01 level (p = 0.989). In females, the relationship between LESN-GT (6.39 ± 0.59) and PSIS-GT (12.2 ± 3.70) shows moderate negative correlation (rs = -0.476) which was not statistically significant at 0.01 level (p = 0.195). The dimension of LESN-GT which was observed to be longer in females was deemed to account for the deviation of sciatic nerve of females from the males’ topographic anatomical relations.
Description
Scholarly articles
Keywords
Sciatic nerve , Morphometry , Topography , Variations , Research Subject Categories::MEDICINE
Citation
Mbaka G, Osinubi A. Morphometric study of sciatic nerve and its topographic anatomical variations in relation to landmark structures around pelvis: a Nigerian population study. Folia Morphol (Warsz). 2020 Dec 17. doi: 10.5603/FM.a2020.0144. Epub ahead of print. PMID: 33330968.