Anatomy and Cell Biology 2221 Lecture Notes - Lecture 3: Masseter Muscle, Digastric Muscle, Pterygoid Processes Of The Sphenoid
27 Feb 2017
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Document Summary
Most of facial muscles insert on skin. Occipitofrontalis (frontal belly) raise back of scalp (draws scalp forward: origin: sheet of dense regular tissue on top of head, insertion: skin of the superorbital margin of the frontal bone (on eyebrow) Orbicularis oculi: circles the eye, closes the eye: origin: medial wall of orbit (frontal and maxilla, insertion: tissue of the eyelid. Levator labii superioris: above the lip, raises lip upward: origins: maxilla below eye socket and zygomatic bone, inserts: orbicularis oris (muscle that circles the mouth) Zygomaticus minor and major: cheek bone, opening the mouth and raising the lip, smiling muscle: origin: zygomatic bone, insertion: orbicularis oris. Depressor anguli oris: lowers the angle of mouth, draws your mouth down and laterally: origins: mandible, insertion: orbicularis oris. Corrugator supercilii: above eyebrow, draws eyebrows medially and inferiorly (confused look: origin: frontal bone, insertion: skin of eyebrows. Nasalis: nose, pulls open airways (nasal pathways: origin: maxilla, insertion: apneurosis.
