What does the lateral pterygoid plate do?
The primary function of the lateral pterygoid muscle is to pull the head of the condyle out of the mandibular fossa along the articular eminence to protrude the mandible.
What is the purpose of the Pterygoideus Medialis?
Function. The medial pterygoid muscle has functions including elevating the mandible (closing the mouth), protruding the mandible, mastication (especially for when the maxillary teeth and the mandibular teeth are close together), and excursing the mandible (contralateral excursion occurs with unilateral contraction).
Which are functions of the medial and lateral pterygoid muscles?
The medial pterygoid muscle attaches to the angle of the mandible and to the lateral pterygoid plate to form a sling with the masseter muscle that suspends the mandible (Figure 6-19). The primary action is to elevate the mandible and laterally deviate it to the opposite side.
What does Pterygoideus mean?
adj. 1. Of, relating to, or located in the region of the sphenoid bone: a pterygoid muscle. 2. Resembling a wing; winglike.
What does the masseter muscle do?
The masseter muscle is one of the four muscles responsible for the action of mastication (chewing). When the masseter contracts it causes powerful elevation of the mandible causing the mouth to close.
What drains into pterygoid plexus?
In addition, the inferior ophthalmic vein and deep facial vein also drain into the pterygoid plexus. The plexus itself drains via the short maxillary vein before it forms the retromandibular vein. Emissary veins also anastomose between the plexus and the cavernous sinus, via the foramina ovale and lacerum.
Which arteries supply blood to the medial and lateral pterygoid muscles?
maxillary artery
Blood Supply and Lymphatics The medial pterygoid muscle receives vascular supply from the maxillary artery through its pterygoid branches and by the facial artery through its muscular branches. The pterygoid branches of the maxillary artery are 2 or 3 in number.
What are the muscles of mastication?
Muscles
- Temporalis Muscle.
- Medial Pterygoid.
- Lateral Pterygoid.
- Masseter.
- Accessory Muscles of Mastication.
Where is the Hamulus?
Anatomical terms of bone The pterygoid hamulus is a hook-like process at the lower extremity of the medial pterygoid plate of the sphenoid bone of the skull.
Where are the muscles of the lateral pterygoid located?
Lateral pterygoid muscle (Musculus pterygoideus lateralis) Lateral pterygoid is a two-headed, fan-shaped muscle located in the infratemporal fossa of the skull. It is one of the four masticatory muscles, along with the medial pterygoid, temporalis and masseter muscles. All these muscles act upon the temporomandibular joint (TMJ)
When do you pronounce La, the pterygoid muscle opens your mouth?
The mnemonic “La” and “Me” is useful to quickly recall the functions of the pterygoid muscles at any time. When you pronounce “La” – your jaw is now open, so the lateral pterygoid muscle opens the mouth.
Where does the superior head of the pterygoid come from?
The smaller superior head arises from the infratemporal crest of the greater wing of sphenoid bone , while the larger inferior head arises from the lateral surface of the lateral pterygoid plate. The fibres of both muscle heads merge and insert on the pterygoid fovea on the neck of the mandible .