MUSCLES OF THE FACIAL EXPRESSION- oral group

Question 1

orbicularis oris

Answer 1

1. tonus closes rima oris

2. phasic contraction compresses and protrudes lips for kissing and resists distension when blowing

Question 2

buccinator

Answer 2

1. cheek muscle
2. presses cheek against molar teeth
3. works with the tongue to keep food between occlusal surfaces and out of the oral vestibule
4. also resist distention when blowing

Question 3

depressor anguli oris

Answer 3

1. depresses the corner of the mouse

2. active during frowning

Question 4

depressor labii inferioris

Answer 4

1. depresses lower lip and moves it laterally

2. pouting and sadness

Question 5

mentalis

Answer 5

1. elevates and protrudes lower lip
2. elevates skin of the chin
3. showing doubt

Question 6

risorius

Answer 6

1. dilates the mouth

2. depresses labial commissure bilaterally to frown(sadness)

Question 7

zygomatic major

Answer 7

1. dilates the mouth

2. elevates labial commissure bilaterally to smile(happiness), unilaterally to sneer(disdain)

Question 8

zygomatic minor + levator labii superioris

Answer 8

1. dilates the mouth
2. elevate the upper lip
3. deepen nasolabial sulcus showing sadness

Question 9

lavator labii superioris alaeque nasi

Answer 9

1. assist in flaring the nares

2. medial to the levator labii superioris

Question 10

levator anguli oris

Answer 10

1. dilates the mouth
2. widens oral fissure
   3 grimacing or grinning