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Morphometric evaluation of the foramen magnum in a Sri Lankan population

Authors:

R. Peiris ,

University of Peradeniya, LK
About R.
Division of Anatomy, Department of Basic Sciences, Faculty of Dental Sciences
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A. Vadysinghe,

University of Peradeniya, LK
About A.
Department of Forensic Medicine, Faculty of Medicine
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D. Nanayakkara

University of Peradeniya, LK
About D.
Division of Anatomy, Department of Basic Sciences, Faculty of Dental Sciences
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Abstract

Objective: The foramen magnum (FM) that transmits a large number of vital structures is an important anatomical landmark in neurosurgical procedures and forensic anthropology. The aim of the present study was to determine the dimensions and shape of the FM in a Sri Lankan population. Material and

 

method: Forty-four adult skulls (32 males and 12 females) were selected for the study. Sagittal (FMSD) and transverse (FMTD) diameters of the FM were taken using a sliding digital vernier caliper to the nearest 0.01mm by one investigator. The area of the FM was calculated using Radinsky's formula; A=1/4 X 3.14 X FMTD X FMSD and FM index was calculated using the formula: FMTD x 100 / FMSD. The skulls were visually assessed to determine the shape of the FM. The shape of the FM was recorded as round, oval, egg-shaped, tetragonal, pentagonal, hexagonal or irregular.

 

Results: The mean sagittal and transverse diameter, area and index of the foramen magnum in males were 34.62 ±2.17 mm, 29.52±2.13 mm, 695.77±90.64 mm2 and 85.41±5.66, respectively, whereas they were 33.87±2.31 mm, 28.28±1.99 mm, 662.56±98.67 mm2 and 83.69±6.13, respectively, in females. The shape of the foramen was found to be eggshaped in 34.1%, and round in 27.2% of the cases.

 

Conclusions: The size and shape of the foramen magnum are highly variable among different world populations. Sri Lankan skulls showed smaller foramen magnum in compare with those of African, Mediterranean and European populations. Males displayed larger mean values than females for all measured variables.
How to Cite: Peiris R, Vadysinghe A, Nanayakkara D. Morphometric evaluation of the foramen magnum in a Sri Lankan population. Sri Lanka Anatomy Journal. 2019;3(2):29–41. DOI: http://doi.org/10.4038/slaj.v3i2.60
Published on 30 Dec 2019.
Peer Reviewed

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