Assuntos
Anatomia , Médicos , Humanos , Autonomia Pessoal , Profissionalismo , Anatomia/educação , Atitude do Pessoal de SaúdeRESUMO
PURPOSE: With emphasis on the clinical setting, knowledge of anatomical variation decreases misdiagnoses and surgical complications. We report a previously undocumented variant of sternalis muscle and recommend an augmented classification scheme. METHODS: Dissection of the anterior thoracic wall on an 83-year-old female cadaver revealed bilateral sternalis muscles. The Snosek et al. classification system was referenced to describe the variant types. RESULTS: The right sternalis muscle has a single belly and can be classified using the Snosek et al. classification system as a simple type, right single. The left sternalis muscle presented with three muscle bellies, each having a unique pattern of superior attachments (heads). This variation is previously undocumented and requires a more detailed classification. CONCLUSIONS: We propose the addition of a new subtype of sternalis classification, as well as a modification to the Snosek et al. (Clin Anat 27:866-884, 2014) classification scheme, to include classification of different muscle bellies when multiple are present.
Assuntos
Variação Anatômica , Músculo Esquelético/anatomia & histologia , Esterno/anatomia & histologia , Parede Torácica/anatomia & histologia , Idoso de 80 Anos ou mais , Cadáver , Feminino , HumanosRESUMO
PURPOSE: We propose an addition to the Snosek et al. classification to include a subtype variant of sternalis muscle: mixed type and triple subtype. METHODS: Dissection of the anterior thorax of a 96-year-old female cadaver revealed bilateral sternalis muscles with an undocumented variant of the right sternalis muscle. RESULTS: The left sternalis muscle presented as a simple type-left single using the Snosek et al. classification scheme. The right sternalis muscle revealed a previously undocumented classification type. It consisted of three bellies and two heads, with the lateral head formed by two converging bellies and the medial head formed from the superficial medial belly. CONCLUSIONS: The unique presentation of right sternalis muscle can be classified by expanding the Snosek et al. classification scheme to include triple-bellied subtypes. This presentation is classified as a mixed type-right triple, with single bicipital converging and single bicipital diverging. Documentation of sternalis muscle variations can prevent misdiagnoses within the anterior thorax.
