Muscles of Mastication: Difference between revisions
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== Introduction and Overview == | == Introduction and Overview == | ||
The muscles of mastication are group of muscles responsible for the chewing movement of the mandible at the temporomandibular joint, they | * The muscles of mastication are group of muscles responsible for the chewing movement of the mandible at the temporomandibular (TMJ) joint, they enhance the process of eating, they assist in grinding food, and also function to approximate the teeth. | ||
The four main muscles of mastication originate from the surface of the skull and they | * The four main muscles of mastication originate from the surface of the skull and they attach onto the rami of the mandible at the TMJ . | ||
The movement performed by these muscles | * The movement performed by these muscles is: elevation, depression, protrusion, retraction, and side to side movement. | ||
Unlike the muscles of facial expression that are innervated by the facial nerve ( | * Unlike the muscles of facial expression that are innervated by the facial nerve (CN VII), the muscles of mastication are innervated by motor branches of the mandibular division of the trigeminal nerve (CNV3), while the main arterial supply is derived from branches of the maxillary artery. | ||
== Description == | == Description == | ||
The muscles of mastication can divided into the primary muscles and secondary or accessory muscles.There are four muscles that makes up the primary muscles, these muscles include: | |||
* Masseter | |||
* Temporalis | |||
* Lateral pterygoid | |||
* Medial pterygoid | |||
The secondary or accessory muscles are; | |||
* Buccinator | |||
* Suprahyoid muscles (digastric muscle, myohyoid muslce, and geniohyoid muscle) | |||
* Infrahyoid muscles (the sternohyoid, sternothyroid, thyrohyoid, and omohyoid muscle) | |||
=== Origin === | === Origin === |
Revision as of 01:00, 17 October 2020
Original Editor - User Name
Top Contributors - Olajumoke Ogunleye, Wendy Walker, Joao Costa, Kim Jackson, Vidya Acharya, Areeba Raja and Ahmed M Diab
Introduction and Overview[edit | edit source]
- The muscles of mastication are group of muscles responsible for the chewing movement of the mandible at the temporomandibular (TMJ) joint, they enhance the process of eating, they assist in grinding food, and also function to approximate the teeth.
- The four main muscles of mastication originate from the surface of the skull and they attach onto the rami of the mandible at the TMJ .
- The movement performed by these muscles is: elevation, depression, protrusion, retraction, and side to side movement.
- Unlike the muscles of facial expression that are innervated by the facial nerve (CN VII), the muscles of mastication are innervated by motor branches of the mandibular division of the trigeminal nerve (CNV3), while the main arterial supply is derived from branches of the maxillary artery.
Description[edit | edit source]
The muscles of mastication can divided into the primary muscles and secondary or accessory muscles.There are four muscles that makes up the primary muscles, these muscles include:
- Masseter
- Temporalis
- Lateral pterygoid
- Medial pterygoid
The secondary or accessory muscles are;
- Buccinator
- Suprahyoid muscles (digastric muscle, myohyoid muslce, and geniohyoid muscle)
- Infrahyoid muscles (the sternohyoid, sternothyroid, thyrohyoid, and omohyoid muscle)