Muscles: L/A or O/I/A Flashcards
Frontalis
L/A
L: Covers forehead and dome of skull
A:
- elevates the eyebrows
- wrinkles forehead skin horizontally
Occipitalis
L/A
L: overlies posterior occiput
A: fixes aponeurosis and pulls scalp posteriorly
Orbicularis oris
L/A
L: encircles the mouth A: - closes lip - purses and protrudes lips - kissing and whistling muscle
Corrugator
L/A
L: above the eye
A:
- draws eyebrows medially and inferiorly
- wrinkles skin of forehead vertically
Zygomaticus
L/A
L: muscle pair extending diagonally from cheekbone to corner of mouth
A: raises lateral corners of mouth (smiling muscle)
Orbicularis oculi
L/A
L: surrounds the eye
A:
- closes eye
- produces blinking, squinting, and draws eyebrows inferiorly
Risorius
L/A
L: inferior and lateral to zygomaticus
A:
- draws corner of lip laterally
- tenses lips
Buccinator
L/A
L: deep to the masseter A: - compresses cheek - draws corner of the mouth laterally - holds food b/w teeth
Depressor labii inferioris
L/A
L: runs from mandible to lower lip
A: depresses lower lip
Mentalis
L/A
L: one of the muscle pair forming a V-shaped muscle mass on chin
A:
- wrinkles chin
- protrudes lower lip
Levator palpebrae superioris
L/A
L: upper eyelid
A: raise the upper eyelid
Levator labii superioris
L/A
L: extends from side of nose to zygomatic bone
A:
- opens lip
- elevates and furrows the upper lip
Platysma
L/A
L: covers superficial neck muscles A: - tenses skin of neck - helps depress mandible - pulls lower lip back and down
