Muscles

LATERAL PTERYGOID MUSCLE INSERTION

Both heads then unite, passing posteriorly to insert on the anterior surface of the neck of the mandibulaoa condyle at the pterygoid fovea.

TEMPORALIS MUSCLE INSERTION .

Insert : The muscle then passes inferiorly to insert on the coronoid process of the mandible and anteromedial border of the mandibular ramus

MEDIAL PTERYGOID MUSCLE ACTION.

It elevates the mandible, raising the lower jaw. Elevation of the mandible occurs during the closing of the jaws. This muscle is weaker than the masseter muscle in this action.

MEDIAL PTERYGOID MUSCLE ORIGIN

It originates from the pterygoid fossa on the medial surface of the lateral pterygoid plate of the sphenoid bone.

MASSETER MUSCLE ACTION.

The action of the muscle when there is bilateral contraction of the entire muscle is to elevate the mandible, raising the lower jaw Elevation of the mandible occurs during the closing of the jaws.

LATERAL PTERYGOID MUSCLE ACTION

The inferior head has a slight tendency to depress the mandible, lowering the lower jaw Depression of the mandible occurs during the opening of the jaws. . The main action when both muscles contract is to bring the lower jaw forward, thus causing the protrusion of the mandible. Protrusion of the mandible often occurs during opening of the jaws.

LATERAL PTERYGOID MUSCLE The inferior head originates

The inferior head originates from the lateral surface of the lateral pterygoid plate of the sphenoid bone.

medial pterygoid muscle INSERTION.

insert on the medial surface of the angle of the mandible.

insertion

.The insertion is the other end of the muscle and is attached to the more movable structure.

INNERVATION muscles of mastication

All the muscles of mastication are innervated by the mandibular division of the fifth cranial, or trigeminal, nerve.

MASSETER MUSCLE

. The masseter muscle is a broad, thick, rectangular muscle located on each side of the face, anterior to the parotid salivary gland: it has two heads.

TEMPORALIS MUSCLE . ACTION.

If the entire muscle contracts, the main action is to the mandible, raising the lower jaw. Elevation of the mandible occurs during the closing of the jaws.

TEMPORALIS MUSCLE ORIGIN

Origin temporal fossa that is bound at the top by the inferior temporal line and at the bottom by the infratemporal crest.

MEDIAL PTERYGOID MUSCLE

The medial pterygoid muscle is deeper, yet similar in form to the superficial masseter muscle.

action of the muscle

The movement that is accomplished when the muscle fibers contract is the action of the muscle

muscles of mastication

The muscles of mastication are four pairs of muscles attached the mandible. . They include the masseter, temporalis, medial pterygoid, and lateral pterygoid muscles.

origin

The origin is the end of the muscle that is attached to the least movable structure.

LATERAL PTERYGOID MUSCLE superior head originates

The superior head originates from the inferior surface of the greater wing of the sphenoid bone

TEMPORALIS MUSCLE

The temporalis muscle is a broad, fan-shaped muscle of mastication located on each side of the head that fills the temporal fossa, superior to the zygomatic arch.

MASSETER MUSCLE ORIGIN AND INSERTION

superficial head originates lower border of the zygomatic arch. The deep head originates from the posterior surface of the zygomatic arch. insert on the mandible. The superficial head inserts on the lateral surface of the angle, and the deep head inserts on the ramus superior to the angle