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Histology II > GI > Flashcards

Flashcards in GI Deck (18):
1

Layers of the Alimentary canal

1.) Mucosa (epithelium, lamina propria, muscularis mucosae)
2.) Submucosa
3.) Muscularis externa
4.) Serosa/Adventitia

2

Epithelial lining of the oral cavity

stratified squamous

3

Epithelial lining of the esophagus

stratified squamous

4

Epithelial lining of the stomach

simple columnar

5

Epithelial lining of the intestine

simple columnar

6

describe the muscularis mucosae (general alimentary canal)

composed of SMOOTH muscle only

7

location of Meissner's Plexus

Submucosa

8

Location of Auerbach's plexus

between the longitudinal and circular layers of the muscularis externa

9

Serosa vs Adventitia

Serosa is within the peritoneal cavity - simple squamous epithelium

Adventitia- OUTSIDE the peritoneal cavity- whispy fibers that blend into connective tissue of the surrounding structures

10

Muscularis externa of the alimentary canal

two layers (inner circular and outer longitudinal)

smooth muscle in most of the canal (skeletal muscle in upper esophagus -mixed in middle esophagus)

11

Layers of the Oral cavity

Epithelium
Lamina Propria
Submucosa

12

What layers are absent in the oral cavity

No muscularis mucosae
No Muscularis externa
No serosa/adventitia

13

Describe the submucosa of the oral cavity

Not clearly separated from . lamina propria (look where the glands are)

Minor salivary glands located here

14

Minor salivary glands of the oral cavity

Intrinsic (located within the wall of the oral cavity)

Mucous secreting (watery- not very many enzymes)

Branched tubular glands

15

Surface of the tongue

covered with stratified squamous epithelium (often straified on the dorsal side)

16

Types of lingual papillae

1.) Filliform Papillae
2.) Fungiform Papillae
3.) Circumvallate
4.) Foliate Papillae

17

Filliform Papilla

most abundant type

Mostly on the anterior of the tongue

keratinized, sharp point tips (tips point backwards)

NO SENSE functions- mechanical function, grabs onto food

18

Fungiform Papillae

mushroom shaped

more abundant near the tip of the tongue (anterior)

taste buds located on the apical surface