A and P Muscles
Terms
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Epicranius
Frontal and Occipital Belly -
Origin: galea aponeurotica
Insertion: skin of eyebrows and root of nose
Action: raises eyebrows and pulls scalp posteriorly - Orbicularis Oculi
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Origin: Frontal and maxillary bones and ligaments around orbit
Insertion: Encicles orbit and inserts in tissue of eyelid
Action: closes eye - Corrugator Supercilii
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Origin: arch of frontal bone above the nasal bone
Insertion: skin of eyebrow
Action: draws eyebrows medially and inferiorly, wrinkles skin of forehead vertically - Levator Labii Superioris
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Origin: Zygomatic bone and infraorbital margin of maxilla
Insertion: skin and muscle of upper lip and border of nostril
Action: Raises and furrows upper lip and opens lips - Zygomaticus- major and minor
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Origin: Zygomatic bone
Insertion: Skin and muscle at corner of mouth
Action: raises lateral corners of mouth upward (smiling muscle) - Risorius
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Origin: Fascia of masseter muscle
Insertion: Skin of angle of mouth
Action: Draws corners of lip laterally; tense lip; zygomaticus synergist - Depressor labii inferioris
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Origin: Body of Mandible lateral to its midline
Insertion: Skin and muscle of lower lip
Action: Draws lower lip inferiorly - Depressor anguli oris
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Origin:Body of mandible below incisiors
Insertion:Skin and muscle at angle of mouth below insertion of zygomaticus
Action: Zygomaticus antagonist; draws corners of mouth downward and laterally. - Orbicularis oris
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Origin: Arises indirectly from maxilla and mandible ; fibers blended with fibers of other muscles associated with lips
Insertion: Encircles mouth; inserts into muscle and skin at angles of mouth.
Action: Closes mouth; purses and protrudes lips (kissing and whistling muscle) - Mentalis
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Origin: Mandible below incisors
Insertion: Skin of chin
Action: Protrudes lower lip; wrinkles chin