Sphenomandibular Muscle or Deep Bundle of Temporal Muscle?

Abstract

SUMMARY:The muscle designated by a group of authors as the sphenomandibular or, according to recent studies, the deep bundle of the temporal muscle, presents important anatomical relationships, especially in a medical-odontological context. In view of this divergence, the aim of the present study was to observe the morphology by means of dissection of the formaldehyde-preserved heads, using two different techniques to access the muscle region in question, designated as trans-zygomatic and frontal access routes. The results permitted, by observation of the dissections frontally, the presence of fascicles standing apart from the deep bundle muscle venter, which was named intermediary bundle. This bundle presented two portions, a meaty upper portion and a tendinous lower portion, which continues with the tendinous part of the superficial bundle present on the internal surface of the coronoid process. In view of the material observations, it can be concluded that, due to the total absence of muscular fascia between its bundles, the temporal muscle is a unique entity presenting three bundles -the deep, the intermediate and the superficial.KEY WORDS: Sphenomandibular muscle; Dissection; Deep bundle of the temporal muscle.

Padrão De Reatividade Da Enzima Tirosina Hidroxilase No Núcleo Accumbens Durante a Senescência Do Rato

“…Segundo os autores, a largura média da PPMT foi de 1,45 cm no lado esquerdo e 1,44 cm no lado direito, e seu comprimento médio foi de 5,27 mm no lado esquerdo e 5,24 mm no lado direito. Porém, em estudo mais recente, realizado por meio de dissecação de 10 cabeças, Palomari et al (2013) concluíram que, devido à ausência de fáscia entre os três feixes musculares, trata-se do próprio músculo temporal como entidade única e não outro músculo denominado esfenomandibular.…”

Frequency and Characterization of the Infratemporal Spine in a Sample of Chilean Human Skulls

“…Also, the description of the current temporary muscle dissections have demonstrated the presence of a deep temporal fascicle, inserted in the infratemporal spine (Geers et al;Palomari et al;Schön Ybarra & Bauer;Sedlmayr et al, 2009). Several authors have linked this with the possible pathogenesis of the trigeminal neuralgia, originating in the maxillary division, by compression in the vicinity of the round foramen (Fuentes et al; Schön Ybarra & Bauer).…”

“…This element has become important again because it has been described as the origin of the deep portion of the temporal muscle, known in the literature as the sphenomandibular fascicle (Dunn et al, 1996). Some authors describe it as a separate muscle, however, most others agree that it is a deep medial portion of the temporal muscle as it is not separated by any type of fascia and also presents a common innervation with the rest of the muscle (Dunn et al;Shimokawa et al, 1998;Geers et al, 2005;Palomari et al, 2013). The new interest in this muscle fascicle is due to its possible association in triggering orofacial pain, mainly referred to the second division of the trigeminal nerve (maxillary nerve) by direct compression of the nerve at the round foramen (Schön Ybarra & Bauer; Fuentes et al, 2009).…”

RESISTÊNCIA MECÂNICA E COMPOSIÇÃO MINERAL DAS CONCHAS DE MEXILHÕES (Pachoides pectinatus)

“…O tubérculo esfenoidal e a crista infratemporal da asa maior do osso esfenóide Porém, em estudo mais recente, realizado por meio de dissecação de 10 cabeças, Palomari et al (2013) concluíram que, devido à ausência de fáscia entre os três feixes musculares, trata-se do próprio músculo temporal como entidade única e não outro músculo denominado esfenomandibular. A inervação do músculo temporal se dá pelos nervos temporais profundos (ramo do nervo mandibular, terceira divisão do nervo trigêmeo) (Baker et al, 2012;Tortora & Nielsen, 2013).…”