Histology of Upper GI

Question 0

What is the supporting wall to the lip?

Answer 0

Orbicularis oris

Question 1

What are the generic layers to the walls of the digestive tract?

Answer 1

Mucosa
Submucosa
Supporting wall
Adventitia or serosa

Question 2

What is histologically different for the red area of the lip in comparison to the cutaneous and oral mucosa regions?

Answer 2

Deep dermal papillae

Question 3

How is the oral mucosa histologically different from the red area or cutaneous area of lip?

Answer 3

Nonkeratinizing epithelium

Question 4

What is the supporting wall to the cheek?

Answer 4

Buccinator muscle

Question 5

What change in the cheek histology (from lip histology) helps to reduce chomping?

Answer 5

More elastic tissue in submucosa

Question 6

What areas of the oral cavity are keratinized?

Answer 6

Top of tongue
Hard Palate
Red area and cutaneous area of lip

Question 7

What is present in the submucosa of the posterior 2/3 of hard palate and on the soft palate?

Answer 7

Seromucous glands

Question 8

What histologically separates the soft palate and hard palate?

Answer 8

Hard palate has bone support, soft palate has muscle support

Question 9

What are four papillae of the mucosa on the dorsal tongue?

Answer 9

Circumvallate papillae
Fungiform papillae
Filiform papillae
Foliate papillae

Question 10

What nerves supply the anterior 2/3 of the tongue with sensory info? Posterior 1/3?

Answer 10

Anterior: V and VII
Posterior: IX and X

Question 11

Where are the circumvallate papillae on the tongue surface?

Answer 11

Posterior

Question 12

What persistent feature of the tongue gives rise to the thyroid gland?

Answer 12

Foramen Cecum

Question 13

What do the deep layers of the posterior 1/3 of the tongue contain?

Answer 13

Many lymphocytes, considered lingual tonsil

Question 14

Which papillae have the most direct taste bud association?

Answer 14

Fungiform papillae

Question 15

Which papillae are most like the cat tongue?

Answer 15

Filiform papillae

Question 16

Which papillae are the most numerous?

Answer 16

Filiform

Question 17

What do fungiform papillae look like?

Answer 17

Club shaped, reddish tint

Question 18

What is the role of Von Ebner’s glands?

Answer 18

Flush out debris from circumvellate papillae crypts

Question 19

What should we know about foliate papillae?

Answer 19

Not well developed in humans
Associated with taste buds
On the side of the tongue

Question 20

What cells are a part of a taste bud?

Answer 20

Sustentacular cells
Taste receptor cells
Basal cells

Question 21

What makes dentin?

Answer 21

Odontoblasts

Question 22

What makes enamel?

Answer 22

Ameloblasts

Question 23

What is the role of the periodontal ligament?

Answer 23

collagenous fibers act as sling

Question 24

What composes enamel?

Answer 24

3% protein | 97% mineral

Question 25

What is the composition of dentin?

Answer 25

30% protein | 70% minerals

Question 26

What embryonic tissue makes teeth?

Answer 26

mesenchyme

Question 27

``` From oustide to in, order the following: Amelioblasts Enamel Dentin Odontoblasts ```

Answer 27

Amelioblasts Enamel Dentin Odontoblasts

Question 28

What are the major salivary glands?

Answer 28

Parotid Submandibular Sublingual

Question 29

What is the morphology of salivary glands?

Answer 29

Connective tissue capsule | Many lobes and lobules

Question 30

What is the normal histology for salivary ducts?

Answer 30

Secretory unit Intercalated duct Striated/interlobular/secretory duct Excretory portion/interlobar duct

Question 31

Which is the smallest portion of a salivary duct?

Answer 31

Intercalated duct

Question 32

What are myoepithelial cells?

Answer 32

Specialized smooth muscle cells, assist discharge of secretory cells

Question 33

Where are myoepithelial cells?

Answer 33

Secretory unit and beginning of intercalated duct

Question 34

What does the submandibular gland look like on a slide?

Answer 34

Not that much of a connective tissue capsule Scarce Intercalated ducts Mostly serous acini

Question 35

What is distinguishable about the sublingual duct?

Answer 35

Striated ducts nonprevelant Intercalated ducts nonexistent Acini mostly mucosal

Question 36

What trends do you see in esophageal histology as you move from top to bottom?

Answer 36

Top 1/3: Mucous glands in mucosal layer, skeletal muscle around outside Middle 1/3: Mucous glands in submucosa, Mix of skeletal and smooth muscle around outside Bottom 1/3: Mucous glands in mucosal layer, Smooth muscle around outside