Oral Cavity + Esophageal Histology

Question 1

Layers of tissue in digestive tract

Answer 1

mucosa

submucosa

muscularis externa

serosa

Question 2

Nerve plexes

Answer 2

submucosal (Meissner) nerve plexus

⇒ secretions

myenteric (Auerbach) plexus

⇒ motor/motility

Question 3

Soft palate

tissue types

Answer 3

SS keratinizing on oral side

pseudostratified columnar ciliated on nasal side

Question 4

Tongue tissue types

Answer 4

ventral: SS non-keratinizing
dorsal: SS keratinizing

Question 5

Layers of muscle in tongue

Answer 5

3 sk muscle

Question 6

Sensory innervation of tongue

Answer 6

ant 2/3: V (general) and VII (taste)

post 1/3: IX (general and taste)

Question 7

Filiform papillae

Answer 7

most abundant

keratinizing (only ones)

Question 8

Fungiform papillae

Answer 8

tip of tongue

club-shaped on histology

Question 9

Circumvallate papillae

Answer 9

back of tongue by sulcus terminalis

surrounded by deep trench/moat histologically

Question 10

Foliate papillae

Answer 10

poorly developed in humans

Question 11

Excretory ducts

Answer 11

round, open space

Question 12

Striated ducts

Answer 12

round, striated

Question 13

Intercalacted ducts

Answer 13

cuboidal-looking–less triangular

Question 14

Alveolus

Answer 14

mucus: clear
serous: lots of ER–lots of protein → very dark purple

Question 15

Myoepithelial cells

Answer 15

specialized sm muscle cells

assist in discharge from secretory cells

between secretory epithelium and BM

Question 16

Mucus gland locations in esophagus

Answer 16

upper: mucosal
middle: submucosal
lower: mucosal

Question 17

Function of submucosal (Meissner’s) plexus

Answer 17

secretions

Question 18

Function of myenteric (Auerbach’s) plexus

Answer 18

motor/motility