Masseter muscle
Masseter Muscle
The Masseter Muscle (pronunciation: /mæˈsiːtər/), is a thick, rectangular muscle of mastication, or chewing, found in the human jaw. It is one of the strongest muscles in the body relative to its size, and can exert tremendous force.
Etymology
The term "Masseter" is derived from the Greek word "μάσητήρ" (másētḗr), meaning "chewer" or "gnasher". This is in reference to the muscle's primary function in the process of mastication.
Anatomy
The Masseter Muscle is divided into two parts, the superficial part and the deep part. The superficial part originates from the zygomatic arch, while the deep part originates from the posterior third of the lower border and from the whole of the medial surface of the zygomatic arch. Both parts insert at the angle and lower half of the lateral surface of the mandible.
Function
The primary function of the Masseter Muscle is mastication, specifically the closing of the jaw. It also assists in side-to-side movement of the jaw, which is important in grinding food.
Related Terms
- Mastication: The process of chewing food in preparation for swallowing and digestion.
- Zygomatic arch: The bony arch at the side of the skull that spans from the area of the cheek to just above the ear canal.
- Mandible: The lower jawbone, which holds the lower teeth in place and forms the bottom of the mouth's structure.
See Also
- Temporalis muscle: Another muscle of mastication, which retracts and elevates the mandible.
- Pterygoid muscles: A pair of muscles that assist in opening the mouth and moving the jaw sideways.
External links
- Medical encyclopedia article on Masseter muscle
- Wikipedia's article - Masseter muscle
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