Jaw

Digastric
in Musclesunder Jaw
Posted On December 17 2018. Updated On December 17 2018.
The digastric muscle (also digastricus) is a small muscle located under the jaw. When the digastric muscle contracts, it acts to elevate the hyoid bone. If the hyoid is being held in place (by the infrahyoid muscles), it will tend to depress the mandible (open the mouth).
Lateral Pterygoid
in Musclesunder Jaw
Posted On December 17 2018. Updated On December 17 2018.
The lateral pterygoid (or external pterygoid) is a muscle of mastication with two heads. It lies superiorly to the medial pterygoid.
Masseter
in Musclesunder Jaw
Posted On December 17 2018. Updated On December 17 2018.
In human anatomy, the masseter is one of the muscles of mastication. The masseter is a thick, somewhat quadrilateral muscle, consisting of two parts, superficial and deep. The fibers of the two portions are continuous at their insertion. The masseter muscle is sometimes the target of plastic jaw reduction surgery.
Medial Pterygoid
in Musclesunder Jaw
Posted On December 17 2018. Updated On December 17 2018.
The medial pterygoid (or internal pterygoid muscle), is a thick, quadrilateral muscle of mastication. The mandibular branch of the fifth cranial nerve, the trigeminal nerve, innervates the medial pterygoid muscle. It consists of two heads. The bulk of the muscle arises as a deep head from just above the medial surface of the lateral pterygoid plate. The smaller, superficial head originates from the maxillary tuberosity and the pyramidal process of the palatine bone.
Salivary Gland
in Musclesunder Jaw
Posted On December 17 2018. Updated On December 17 2018.
The salivary gland consists of parotid, submandibular, and sublingual glands. The parotid glands are the largest of the salivary glands. They are each found wrapped around the mandibular ramus, and secrete saliva through Stensen’s ducts into the oral cavity, to facilitate mastication and swallowing and to begin the digestion of starches.
Temporalis
in Musclesunder Jaw
Posted On December 17 2018. Updated On December 17 2018.
Temporalis is a broad, fan-shaped 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. If the entire muscle contracts, the main action is to elevate the mandible, raising the lower jaw. Elevation of the mandible occurs during the closing of the jaws. If only the posterior part contracts, the muscle moves the lower jaw backward.