A previously unclassified variant of sternalis muscle

The sternalis muscle is an infrequent, non-pathological anatomical variant typically misrepresented in a clinical context. It presents with 3-8% prevalence, according to cadaveric studies. The muscles were identified during routine cadaver prosection at the School of Anatomical Sciences, University of the Witwatersrand. Here, we report two cases of the sternalis muscle in two South African White cadavers. Analysis of the sternalis muscles revealed unilaterally present, distinctly defined muscle masses on the right (case number 1, female) and left (case number 2, male) hemithorax, lateral to the sternum. The muscles occurred with a prevalence of 2.25% within the cadaveric population examined. The prevalence of the sternalis muscle is generally low, especially in the European population. Their presence represents the remnants of the cutaneous muscles in the ventral thorax of lower animals. Clinically, the sternalis muscle may be misinterpreted as a pathological mass or lesion, thus accurate knowledge regarding its variations and prevalence is of importance.

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Evidence of the sternalis muscle in two South African cadavers

Davimes

Bacci

Mazengenya

2018

Surg Radiol Anat

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Describing the sternalis muscle: a new variant and an amended classification

et al. 2018

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Sternal Muscle: A Case Report

Aguiar

Silva²,

Oliveira

et al. 2019

J Morphol Sci

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Introduction The sternal muscle is an anatomical variation found in the anterior region of the thorax. Objective To report the anatomical characteristics of a new type of sternal muscle. Case Report This was a dissection study in which the sternal muscle found was unilateral and long. Discussion Proximal fixation differs from the classification adopted for these cases. Documentation of sternal muscle variations can improve the theoretical database in anatomy as well as aid diagnoses, reducing the probability of the unexpected during clinical and/or surgical thorax-related investigations.

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A previously unclassified variant of sternalis muscle

Cited by 3 publications

References 6 publications

Evidence of the sternalis muscle in two South African cadavers

Evidence of the sternalis muscle in two South African cadavers

Describing the sternalis muscle: a new variant and an amended classification

Sternal Muscle: A Case Report

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