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Head and Neck Muscles
Published in Eve K. Boyle, Vondel S. E. Mahon, Rui Diogo, Handbook of Muscle Variations and Anomalies in Humans, 2022
Eve K. Boyle, Vondel S. E. Mahon, Rui Diogo, Warrenkevin Henderson, Hannah Jacobson, Noelle Purcell, Kylar Wiltz
Poland (1890) considers pterygofascialis to be a variant of the pterygospinous muscle. In one case, pterygofascialis arose from the sphenomandibular ligament and attached to the posterior edge and outer aspect of the medial pterygoid (Poland 1890; Watanabe 2016). In a second case, it had the same origin and attached onto both the posterior edge and outer aspect of the medial pterygoid and the lateral pterygoid plate (Poland 1890). In these cases, the sphenomandibular ligament did not attach to the spine of the sphenoid but to the petrotympanic fissure (Poland 1890).
A to Z Entries
Published in Clare E. Milner, Functional Anatomy for Sport and Exercise, 2019
The majority of bones in the head are fused to each other via sutures to provide a protective shell for the brain. Movement occurs at the temporomandibular joint, to allow opening and closing of the mouth. There are several ligaments associated with this joint. The joint capsule is thickened into a lateral ligament, sometimes referred to as the temporomandibular ligament. This ligament adds support to the lateral aspect of the joint and helps to prevent posterior dislocation. There are two additional ligaments extrinsic to the temporomandibular joint: the stylomandibular and sphenomandibular ligaments. These ligaments connect the mandible to points on the cranium. The stylomandibular ligament runs from the styloid process of the temporal cranial bone to the angle of the mandible distally. The sphenomandibular ligament runs from the spine of the sphenoid cranial bone to the lingula of the mandible, which is superior to the insertion of the stylomandibular ligament.
Anatomy and Embryology of the Mouth and Dentition
Published in John C Watkinson, Raymond W Clarke, Terry M Jones, Vinidh Paleri, Nicholas White, Tim Woolford, Head & Neck Surgery Plastic Surgery, 2018
The sphenomandibular ligament runs from the spine of the sphenoid bone to the lingula of the mandible. It represents the remnants of the perichondrium of the cartilage of the embryonic first branchial arch. The sphenomandibular ligament is slack when the jaws are closed, but during jaw movement becomes tense at about the time when the condyle has passed in front of the lateral ligament.20
Preliminary simulation model toward the study of the effects caused by different mandibular advancement devices in OSAS treatment
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2018
Agnese Brunzini, Antonio Gracco, Alida Mazzoli, Marco Mandolini, Steve Manieri, Michele Germani
For the simulation, the following three contact models have been imposed:Fixed: ground to temporal boneFrictionless: articular disc to glenoid fossa, teeth to MADBonded: articular disc to condyle, temporomandibular ligament to temporal bone, temporomandibular ligament to mandible, sphenomandibular ligament to temporal bone, sphenomandibular ligament to mandible, stylomandibular ligament to temporal bone, stylomandibular ligament to mandible, periodontal ligaments to mandible, periodontal ligaments to teeth.
The Biomechanical Effects of Sagittal Split Ramus Osteotomy on Temporomandibular Joint
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2018
Zhan Liu, Jingheng Shu, Yuanli Zhang, Yubo Fan
The disc not only had backward and inward displacements, but also clockwise rotated in the outer lateral view. Higher tension occurred in the anterior attachments of the discs, as a result of the backward displacement of the disc relative to the condylar and temporal cartilage. Meanwhile, the inward displacement of the disc resulted in a smaller tension (the magnitude of 10e−3) in the posterior attachments. Under the central occlusion, the temporomandibular ligament and sphenomandibular ligament were subjected to a small tension (of the magnitude of 10e−4 to 10e−3), related to the fact that the ligaments mainly prevent the inward displacement of disc. However the stylomandibular ligament relaxed.