PBL 3 (face anatomy)

Question 1

Orbicularis oculi

Answer 1

• Closes the eyelids (obital = forcefully, palpebral =gently)

Question 2

Corrugator supercilli

Answer 2

• wrinkles skin above nose
• deep to eyebrows
• active in frowning

Question 3

Nasalis

Answer 3

• compressor naris closes nostrils

- dilator naris opens nostrils

Question 4

Depressor septi nasi

Answer 4

• pulls nose inferiorly

Question 5

Orbicularis oris

Answer 5

• purses lips

Question 6

Buccinator

Answer 6

• presses cheek against teeth to prevent accumulation of food
• deep to other muscles

Question 7

Lower oral muscles

Answer 7

• depressor anguli oris
• depressor labii inferioris
• mentalis (position lip)

Question 8

Risorius

Answer 8

• grin (mouth lateral and up)

- superficial

Question 9

Zygomaticus major and minor

Answer 9

• smile (raise and lateral)

Question 10

Levator labii superioris

Answer 10

• deepens furrow between nose and corner of mouth in sadness

Question 11

Levator anguli oris

Answer 11

• deep

- elevates corner of mouth and deepens furrow

Question 12

Muscles of mastication

Answer 12

Masseter
Temporaiis
Medial and lateral pterygoid

INNERVATION by mandibular (V3) branch of trigeminal nerve

Question 13

Where do oral muscles intersect?

Answer 13

modiolus

Question 14

Frontalis

Answer 14

Raises eyebrows

Question 15

Course of the parotid duct

Answer 15

crosses medial border of masseter and pierces buccinator