Oral Cavity

Question 1

What is the anterior opening of the oral cavity?

Answer 1

oral fissure -> opens into oral vestibule

Question 2

What are the posterior/lateral walls of the oral cavity?

Answer 2

palatoglossal arches

Question 3

What causes the pink color of lips?

Answer 3

branches from sup and inf labial aa that extend to the surface in CT papillae

Question 4

What bones make the hard palate?

Answer 4

maxilla and palatine

Question 5

Sublingual region features

Answer 5

lingual frenulum, opening of submandibular duct, sublingual fold, sublingual gland

Question 6

Where is the sublingual gland found?

Answer 6

inferior to sublingual fold and sup to mylohyoid m (foundation for oral cavity)

Question 7

What is significant of lingual frenulum?

Answer 7

where embryological structures joined

Question 8

Submandibular duct features

Answer 8

runs along medial aspect of sublingual gland, ends ant and lat to frenulum of tongue, crossed TWICE by lingual n

Question 9

Where does the submandibular duct open?

Answer 9

sublingual caruncle as single opening

Question 10

Where does lingual n run in the oral cavity?

Answer 10

under sup constrictor and medial to lingual raphe, curls under duct and projects to tongue

Question 11

Where does the deep lobe of the submandibular gland lie?

Answer 11

intraorally, duct comes from deep lobe

Question 12

Where is the submandibular ganglion?

Answer 12

level of 3rd molar suspended from lingual n by 2 or more short n brs

Question 13

What travels in the submandibular ganglion?

Answer 13

p-symp fibers from chorda tympani synapse and supply to submandibular and sublingual glands
symp fibers from EC plexus

Question 14

What is the function of extrinsic mm of tongue?

Answer 14

move tongue in various directions, ant, post, lat

Question 15

What is the function of intrinsic mm of tongue?

Answer 15

alter shape

Question 16

What separates the ant 2/3 of tongue from post 1/3?

Answer 16

sulcus terminalis

Question 17

What is the foramen cecum?

Answer 17

small pit that is non-functional sup remnant of proximal part of embryonic thryoglossal duct that developed the thyroid gland

Question 18

Where does styloglossus m originate and insert?

Answer 18

styloid process to tongue

Question 19

Where does hyoglossus O and I?

Answer 19

hyoid bone to tongue

Question 20

Where is genioglossus O and I?

Answer 20

genoid tubercle of mandible to tongue

Question 21

What is the bulk to the mm of tongue?

Answer 21

genioglossus m, post 1/3 = immobile portion

Question 22

What happens in unilateral paralysis of CN XII? Bilateral paralysis?

Answer 22

• deviation of tongue toward paralyzed side, genioglossus m affected
• inability to protrude tongue, falls back and may occlude airway
• CN XII test

Question 23

which a supplies most of the superficial structures of the oral cavity?

Answer 23

facial a

Question 24

Where do the branches of lingual a run?

Answer 24

lingual a runs medial to hyoglossus m giving dorsal lingual a post to mm and other two brs ant to mm

Question 25

What provides taste from root of tongue and epiglottis?

Answer 25

CN X

Question 26

What are infections in teeth bad?

Answer 26

can travel with pterygoid plexus of vv to cavernous sinus and into cranial cavity via emissary vv