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 ?
All 8 patients showed changes in muscles of mastication, including superficial temporalis and deep temporalis, and in masseter muscles.
The muscles of mastication attach the lower jaw to the rest of the skull.
Features of smooth thickening, nerve enhancement, expansion of the involved foramina, involvement of the cavernous sinus, and denervation atrophy of the muscles of mastication are elegantly demonstrated if you know where to look
In addition, phonation prior to imaging can result in symmetric activity in the larynx, involving the vocal cords and posterior cricoarytenoid muscles; jaw clenching or chewing prior to imaging can show activation of muscles of mastication (8); and insulin administration or a nonfasting state can cause diffuse skeletal muscle uptake since insulin drives glucose (and FDG) into skeletal muscles (9) (Figure 3).
Early changes may be detected by palpating the muscles of mastication and the TMJ.
The first arch also gives rise to the muscles of mastication.
The minimum surface tension corresponds to the tension of the saliva film during the compressive phase of mastication when the muscles of mastication i.
Massive muscles of mastication that were present before this myosin-gene mutation occurred could have been constraining brain size by limiting the expansion of [cranial] plates in the developing skull," says University of Pennsylvania School of Medicine anatomist Nancy Minugh-Purvis, a coauthor of the new study.
The sensory impulses for touch, pain, temperature, and sensation are conveyed from most of the face, while the muscles of mastication are supplied by the motor component (Hickey, 2002).
In an 18-year experience with 212 patients with malignant neoplasms in the head and neck region, 9 (4%) had restricted opening of their mouths in which difficulty in opening the mouth was caused by tumor infiltrating the muscles of mastication or by reflex spasm.
Temporomandibular disorders refer to a collection of medical and dental conditions affecting the temporomandibular joint (TMJ) and/or the muscles of mastication (chewing), as well as contiguous tissue components.