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The four classical muscles of mastication elevate the mandible (closing the jaw) and move it forward/backward and laterally, facilitating biting and chewing. Other muscles are responsible for opening the jaw, namely the geniohyoid , mylohyoid , and digastric muscles (the lateral pterygoid may play a role).
The lateral pterygoid muscle (or external pterygoid muscle) is a muscle of mastication. It has two heads. It lies superior to the medial pterygoid muscle. It is supplied by pterygoid branches of the maxillary artery, and the lateral pterygoid nerve (from the mandibular nerve, CN V 3). It depresses and protrudes the mandible. When each muscle ...
[5] 50% of affected individuals develop dental abnormalities such as delayed eruption, dental root exposure, or resorption of the dental roots on the affected side. 35% have difficulty or inability to normally open the mouth or other jaw symptoms, including temporomandibular joint dysfunction and spasm of the muscles of mastication on the ...
head, mouth (left/right) tubercle of mandible: modiolus of mouth: facial artery: facial nerve [CNVII], mandibular branch: depresses angle of mouth (frown) levator anguli oris: 2 1 transversus menti: head, mouth (left/right) continuation of depressor anguli oris muscles other side of depressor anguli oris muscles facial artery
Note that in this mouth the lower wisdom teeth have been removed, slightly changing the shape of the pterygomandibular ligaments that usually curve and attach to the mandible around them. The pterygomandibular raphe is a tendinous band [2] [3] formed by the buccopharyngeal fascia. It is a paired structure, with one on each side of the mouth. [3]
The digastric muscle (also digastricus) (named digastric as it has two 'bellies') is a bilaterally paired suprahyoid muscle located under the jaw.Its posterior belly is attached to the mastoid notch of temporal bone, and its anterior belly is attached to the digastric fossa of mandible; the two bellies are united by an intermediate tendon which is held in a loop that attaches to the hyoid bone.
The researchers looked at the temporalis muscles, which are related to the jaw, on MRI images. Participants were then grouped into categories based on their muscle size.
In anatomy, the temporalis muscle, also known as the temporal muscle, is one of the muscles of mastication (chewing). It is a broad, fan-shaped convergent muscle on each side of the head that fills the temporal fossa, superior to the zygomatic arch so it covers much of the temporal bone. [1] Temporal refers to the head's temples.