Table of Contents
What is pterygoid Lamina?
Either of two plates, the internal and external, that make up the pterygoid process of the sphenoid bone. They are areas of attachment for the muscles of mastication.
What attaches to the lateral pterygoid plate?
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.
Where is the lateral pterygoid muscle?
Lateral pterygoid is located deep to the temporalis and masseter muscles, spanning between the sphenoid bone and temporomandibular joint. Its muscle belly is separated by a small horizontal fissure into two heads; superior (upper) and inferior (lower).
Where does the lateral pterygoid insertion?
Structure. The lateral pterygoid muscle has an upper head and a lower head. The upper head originates on the infratemporal surface and infratemporal crest of the greater wing of the sphenoid bone. It inserts onto the articular disc and fibrous capsule of the temporomandibular joint.
What is lateral pterygoid?
Lateral pterygoid is a two-headed, fan-shaped muscle located laterally in the infratemporal fossa of the skull. It is one of the four masticatory muscles, along with the medial pterygoid, temporalis and masseter muscles.
What is the origin and insertion of the lateral pterygoid?
The lateral pterygoid muscle has an upper head and a lower head. The upper head originates on the infratemporal surface and infratemporal crest of the greater wing of the sphenoid bone. It inserts onto the articular disc and fibrous capsule of the temporomandibular joint.
Where does medial and lateral pterygoid attach?
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 is origin of lateral pterygoid?
Lateral pterygoid muscle
| Origin | Superior head: Infratemporal crest of greater wing of sphenoid bone Inferior head: Lateral surface of lateral pterygoid plate of sphenoid bone |
|---|---|
| Insertion | Superior head: Joint capsule of temporomandibular joint Inferior head: Pterygoid fovea on neck of condyloid process of mandible |
What is the function of the lateral pterygoid?
Function. 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. A concerted effort of the lateral pterygoid muscles helps in lowering the mandible and opening the jaw.
Where do pterygoid muscles attach?
Medial pterygoid muscle
| Origin | Superficial part: Tuberosity of maxilla, Pyramidal process of palatine bone; Deep part: Medial surface of lateral pterygoid plate of sphenoid bone |
|---|---|
| Insertion | Medial surface of ramus and angle of mandible |
Where does the medial pterygoid originate and insert?
What is lateral pterygoid innervated by?
the trigeminal nerve
The lateral pterygoid muscle receives innervation from the mandibular branch of the trigeminal nerve. The main trunk of the mandibular nerve divides into the anterior and the posterior division.
Where does the lateral pterygoid originate and insert?
What happens if the lateral pterygoid muscle is damaged?
However, contracture of a single lateral pterygoid muscle cannot open the mouth but rather results in unproductive movement of the mandible to one side. The injured side is easily identified because the mandible will move towards the injury.
Where does the lateral pterygoid muscle insertion?
What causes lateral pterygoid muscle pain?
The lateral pterygoid is a muscle that moves your jaw side-to-side and front and back. This is the muscle that gets very sore when people grind their teeth.
What is the superior head of the lateral pterygoid?
Superior head: infratemporal fossa. Superior head: anterior side of the condyle. The lateral pterygoid or external pterygoid is a muscle of mastication with two heads. It lies superiorly to the medial pterygoid .
What are the pterygoid processes of the sphenoid?
The pterygoid processes of the sphenoid (from Greek pteryx, pterygos, “wing”), one on either side, descend perpendicularly from the regions where the body and the greater wings of the sphenoid bone unite.
Origin and insertion. The lower/inferior head originates on the lateral surface of the lateral pterygoid plate and inserts onto the neck of condyloid process of the mandible; upper/superior head.
What is the lateral pterygoid fovea?
Inferior head: pterygoid fovea The lateral pterygoid or external pterygoid is a muscle of mastication with two heads. It lies superiorly to the medial pterygoid .