Masticatory Muscles

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Masticatory Muscles

 

a group of four paired muscles in man and animals, providing movement of the lower jaw (mandible) during mastication. The masseter muscle, or the masticatory muscle proper, originates from the zygomatic arch and the temporal fascia and attaches to the angle of the mandible. The temporal muscle, originating from the temporal bone and the temporal fascia, attaches to the coronoid process of the mandible. The pterygoideus internus and externus muscles are deeperlying, originating from the sphenoid bone at the base of the skull; the former attaches to the neck of the condyloid process of the mandible, and the latter to the interior surface of the angle of the mandible.

In addition to providing masticatory movement, the masticatory muscles work with the mimetic muscles to articulate speech, facial expression, and yawning. Several neck muscles—the geniohyoid, mylohyoid, and digastric—also provide movement during mastication. Blood is supplied to the masticatory muscles by branches of the carotid artery. Innervation is provided by the third branch of the trigeminal nerve.

References in periodicals archive ?
The areas of the brain associated with chewing have important roles in the changes that occur in the orofacial functions; they are also responsible for determining the chewing rhythm, as well as for coordinating the activity of the muscles of mastication (3).
Anatomically-based differential diagnosis for the masticator space * Muscles of mastication: Mesenchymal lesions (benign and malignant, such as hemangiomas and sarcomas), lymphoma, benign masseteric hypertrophy, denervation atrophy, idiopathic fibrosis, metastases, myositis ossificans (Figures10B, 10C).
Temporary restorations also help in assessing the response from the muscles of mastication and TMJ to the newly established occlusion [26].
difficulty in opening the jaws and bilateral atrophy of muscles of mastication and its response to immunosuppressive treatment with corticosteroids, which is in agreement with earlier findings.
Posterolaterally it was extended into infratemporal fossa involving muscles of mastication. Laterally ramus of mandible appeared intact (Figure-1).
We report the first case of primary intracranial GS with diffuse, multicompartment invasion of the surrounding skull base, brain parenchyma, orbit, and muscles of mastication, alongside a review of the relevant literature.
Temporomandibular disorders (TMD) are a broad group of problems that affect the temporomandibular joint (TMJ), muscles of mastication, and/or associated bony and soft tissue structures.
Temporomandibular disorders (TMD) are a class of disorders affecting the muscles of mastication and/or the temporomandibular joint (TMJ).
When this occurs to muscles of mastication, the singer will not be able to open her jaw very wide.
Chapter 11: Mandible and Muscles of Mastication. Chapter 12: Temporal Bone (Middle Ear, Cochlea, Vestibular System).
Moller and Sassouni have shown that the forces be- tween the maxilla and mandible, generated by the muscles of mastication, are partly responsible for the spatial relationship of the maxilla and mandible.
Action of the muscles of mastication. Front Oral Biol 1974; 1: 121-158.