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In anatomy, the masseter [help 1] is one of the muscles of mastication. Found only in mammals, it is particularly powerful in herbivores to facilitate chewing of plant matter. [5] The most obvious muscle of mastication is the masseter muscle, since it is the most superficial and one of the strongest.
The first device for measuring masticatory force (gnathodynamometer) was created by Black in 1893. He determined that periodontal tissue is an important issue, which impacts the amount of force. Morill found out that masticatory muscles stop their contraction differently upon the appearance of pain signals from the periodontal tissue. [2]
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).
Dr. Weber worked out that 1 cm 2 cross section surface area of any masticatory muscle can produce approximately 10 kg force. The following average surfaces were found: [4] temporalis - 8 cm 2, masseter - 7.5 cm 2, and medial pterygoid - 4 cm 2 which makes a total of 19.5cm 2. However, this force in some people is measured up to 3900N in ...
It passes laterally superior to the lateral pterygoid muscle, anterior to the temporomandibular joint, and posterior to the tendon of the temporalis muscle. It crosses (the posterior portion of) the mandibular notch alongside the masseteric artery before branching out upon the surface of the masseter muscle, then entering the muscle. [2]
It is located between the lateral aspect of the mandible and the medial aspect of the masseter muscle and its investing fascia. The term is derived from sub-meaning "under" in Latin and masseteric which refers to the masseter muscle. The submasseteric space is one of the four compartments of the masticator space. [1]
A shocking crime investigators say was motivated by greed and cruelty started in Newport Beach, California, and quickly became one of the most surprising cat-and-mouse stories in recent years. In ...
The masseteric fascia is said to cover the masseter muscle, dividing into a superficial layer and a deep layer - the two layers together constituting the parotideomasseteric fascia - to form a fascial compartment that encloses the masseter muscle as well as the medial and lateral pterygoid muscles (the pterygoid muscles being enclosed by the ...