Histology - GI System Flashcards Preview

Histology > Histology - GI System > Flashcards

Flashcards in Histology - GI System Deck (31)
1

Replace all cell types

Stem cells (in isthmus)

1

parts of GI tract with submucosal glands

duodenum, esophagus

2

Stomach - ELSMS/A

E: simple columnar LP: fundic, cardiac, pyloric glands SM: rugae ME: inner oblique, middle circular, outer longitundinal. S/A: serosa

2

Small Intestine - ELSMS/A

E: simple columnae LP: vili, intestinal glands, Peyer's patches (ileum). SM: circular folds, Brunner's glands. ME: inner circular, outer longitunindal. S/A: serosa (except duodenum)

3

apical, small intestine. Antimicrobial secretions that regulate gut flora.

Paneth cells

4

HCl: lowers pH. Intrinsic factor: B12 absorption

Parietal cells

5

Smooth Muscle Sphincter Layer

Muscularis Externa

6

lymphatic capillaries, uptake chylomicrons (modified triglycerides)

Lacteals

6

Transition from simple columnar to stratified columnar to stratified squamous non keratinized

Rectoanal junction

7

Pepsinogen: converted to pepsin by low pH, digests protein

Chief cells

7

Esophagus - ELSMS/A

E: Stratified squamous non-keratinized LP: esophageal cardiac glands (lower) SM: esophageal glands ME: skeletal (upper) -> sk & sm (middle) -> smooth (lower) S/A: Adventitia

9

Secrete hormones like gastrin, CCK, secretin. Regulate gastric, intestinal, pancreatic, gallbladder activity -G cells, I cells, S cells, etc.

Enteroendocrine cells

10

antigen transport cells, phagocytizes antigen & transports it to lamina propria

M cells

11

Soluble mucus: lubrication

Mucous neck cells

11

Large Intesting - ELSMS/A

E: simple columnar. LP: intestinal glands. SM: - ME: inner circular, outer longintudinal (teniae coli). S/A: serosa in transverse and sigmoid. Adventitia in the rest.

12

submucosal glands

Esophageal glands, Brunner's Glands (duodenum)

14

Lacteals, fenestrated capillaries, smooth muscle, GALT

Villus lamina propria components

16

cells found in the follicle-associated epithelium of the Peyer's patch that transportantigens from the gut lumen to immune cells across the epithelial barrier, and thus are important in stimulating mucosal immunity.

M cells (or microfold cells) are

17

permanent infolds of the lamina propria

Intestinal glands

19

Insoluble mucus: barrier

Surface mucous cells

20

Gut mucosal immunology

1. M cells phagocytize antigen and transport ot LP. 2. Immune cells in GALT activate plasma cells. 3. Plasma cells secrete antibodies that are transported to the lumen.

21

outer layer of adventitia

distal duodenum, esophagus, ascending and descending colon, rectum

22

goblet cells secrete mucus for lubrication & protection

Intestinal glands

23

cytoplasmic folds on enterocytes

Microvilli

24

LARGE INTESTINE functions

absorbs electrolytes & water, eliminates waste

25

Enterocytes, Goblet Cells

Villus epithelium components

27

Fundic Glands

surface mucous cels, stem cells, mucous neck cells, parietal cells, chief cells, enteroendocrine cells

28

Stratified squamous non-keratinized to statified squamous keratinized at anus. Internal anal sphincter is smooth muscle while external anal canal is skeletal muscle.

Anal canal

29

permanent outfolds of the lamina propria

Villi

30

permanent folds of submucosa

Circular folds (plicae circulares)

31

LARGE INTESTINE unique features.

Simple columnar epithelium, intestinal glands in LP, teniae coli in outerlongitudinal layer