The four masticatory muscles (muscles of mastication) are responsible for adduction and lateral motion of the jaw.
They are :
- The masseter
- The temporalis (the sphenomandibularis is considered a part of the temporalis by some sources, and a distinct muscle by others)
- The medial pterygoid
- The lateral pterygoid
Each of these primary muscles of mastication is paired, with each side of the mandible possessing one of the four.
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
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