Restorative Chapter 3

Occipitofrontalis

Muscle covers the top of the skull. Consists of two parts. Draws the scalp posteriorly and anteriorly, causing eyebrows to raise and wrinkles on forehead

Depressor anguli oris

Arises from the amndilbe to insert into the anguli oris. Depresses the angle of the mouth

Masseter

Arising form the zygomatic arch and inserting in the mandible. A muscle of mastication. It closes the mandible

Temporalis

Arising in the temporal cavity and inserting in the mandible. A muscle of mastication and strongest chewing muscle. Closes the mandible assists in side to side movement of the mandible.

Platysma

Covers the anterior aspect of the neck. Wrinkles the skin of the neck and chest. Also depresses the mandible and anguli oris, as in pouting.

Procerus

Covers the bridge of the nose. Draws the skin of the forehead inferiorly, causing transverse and vertical wrinkles in the forehead.

Depressor labii inferioris

Depresses the lower lip inferiorly and slighly laterally.

Digastric

Double bellied muscle of the neck. attaches to the mastoid process and mandible. Draws the hyoid bone superiorly.

Zygomaticus minor

Draws the upper lip superiorly and laterally.

Levator labii superioris

Elevates and extends the upper lip

Zygomaticus major

Extends form the cheekbone to the angle of the mouth. Draws the upper lip posteriorly, superiorly, and laterally as in smiling or laughing.

Risorius

Fake smile muscle. Extends from the skin over the masseter muscles to the corners of the mouth. Draws corners of mouth posteriorly.

Orbicularis Oris

Puckering muscle. located in the upper and lower red lips and ingetumentary lips. Closes the lips, compresses lips against teeth. Shapes lips during speech.

Corrugator

Pyramid shaped muscle of facial expression. Lies beneath the frontalis and orbicularis oculi. Known as frowning muscle. Draws the eyebrows inferiorly and medially, as in frowning

Levator labii superioris alaque nasi

Raises the upper lip and dilates the nostrils

Levator palpebrae superioris

Runs from the inside of the ye socket to eh superior tarsal plate of the eyelid.. Raises the upper eyelid

Levator anguli oris

Small muscle at the angle of the mouth. Elevates the angle of the mouth

Orbicularis oculi

Sphincter surrounds the eye socket. Closes the eyelid and compresses the lacrimal sac.

Buccinator

The muscle of the cheek. Originates in the skin over the molar teeth and inserts into the ksin at the anguli oris. Compresses the cheek and pulls the anguli oris posteriorly. Produces the action of sucking.

Mentalis

Tip of the chin. Elevates and protrudes the lower lip. Also wrinkles the skin over the chin.

SCM

originates from the head of the sternum and clavical, and inserts at the mastoid process of the temporal bone. Rotates and depresses the head.