Topographic study of the sphenomandibular muscle
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Data
2012-12
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Resumo
The temporal muscle is housed in the fossa of the bone bearing its name – the temporal
bone. Its origin, body, and insertion have been well studied, and it has been described as a muscle
consisting of three bundles and responsible for various functions. The advancement of technology
has allowed the observation of yet another muscle next to this bundle of fi bers and above the
temporal muscle, namely the sphenomandibular muscle. The present study was designed to
study the topography of the sphenomandibular muscle. Ten anatomical sets (fi ve cadavers) were
dissected with the intention of displaying the topography of the temporal and sphenomandibular
muscles using the techniques of cutting and folding and conventional cross cuts. The folding of the
structures and mapping of the muscles was carried out on four cadavers, analyzing their origins
and describing their bodies and insertions. On another cadaver, cross-sectional (horizontal), 2
mm-thick slices were made in a sequential manner. We observed the topography of the muscle
and its relationship with adjacent structures. The sphenomandibular muscle was found to be
independent of the temporal muscle, for its origin is in the zygomatic-frontal complex, lateral
to the orbit and overlaying the fi ber of the anterior bundle of the temporal muscle. Its body is
separated from the body of the temporal muscle by a thin fascia and is inserted on an oblique
line external to the mandible presenting, therefore, its origin, body, and insertion independent
of the origin, body, and insertion of the temporal muscle.
Descrição
Palavras-chave
Sphenomandibular muscle, Ocular pain, Temporal muscle, Músculo esfenomandibular, Músculo temporal, Dor ocular
Citação
BORGES, Raulino Naves Borges; ÁVILA, Marcos. Topographic study of the sphenomandibular muscle. Stomatos, Canoas, v. 18, n. 35, p. 3-8, July./Dec. 2012.