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Flashcards in Upper GI I Deck (133)
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1

What kind of epithelium lines most of the GI tract

Simple columnar epithelium with glands for most of the tract

2

Musculature of the GI tract

- skeletal muscle at either end and also in the esophagus
- Smooth muscle throughout most GI

3

The GI tract possesses an ______ rhythmicity

intrinsic

4

The GI tract possesses an intrinsic rhythmicity mostly due to the presence of

enteric nervous system

5

The enteric nervous system exists independently of

external influences including the ANS

6

The GI tract has Enteric nervous system (which is independent) but also receives input from

sympathetic and parasympathetic nervous systems

7

What are the peptide neurotransmitters

- Bombesin
- Motilin
- Vasoactive intestinal peptide

8

Unicellular endocrine cells secrete

neuropeptides

9

Unicellular endocrine cells are derived from

endoderm (which is unlike intrinsic nerve fibers, which are derived from neural crest)

10

Intrinsic nerve fibers are derived from

neural crest

11

What is MALT

mucosal associated lymphoid tissue

12

What is GALT

gut associated lymphoid tissue

13

Protective mechanisms of GI include

Production of large amounts of mucous: which assists in lubrication and friction reduction

Rapid turnover of epithelial cells in harsh environments such as the stomach and small intestine

14

The oral cavity is lined with a mucous membrane lying on a _________ layer

Vascular FECT layer

15

The mucosa of the lip consists of

-Stratified Squamous epithelium
- Basement membrane
- Lamina propria

16

The lip is composed of a core of ___________ cells embedded in FECT and covered externally by skin

skeletal muscle cells (obicularis oris)

17

Within the lamina propria of the lip are ____ and ____ glands

mixed and mucous glands

18

The dermis of the lip has a rich plexus of _____ which prominent at the ______ of the lip

capillaries, free margin

19

Internally the lip is lined with ____ keratinized, modified, _________ epithelium lies on a lamina propria with _______ papillae

Poorly, stratified squamous epithelium, high papillae

20

What is the one exception that makes the cheeks structure different than the lip

the cheek has abundant elastic fibers in the submucosa
- These are continuous with the fibers surrounding the striated muscle and the lamina propria
- This arrangement give a maximum of distensibility to the oral mucous membrane

21

What gives the cheek's oral mucous membrane maximum distensibility

abundant elastic fibers in the submucosa are continuous with the fibers surrounding the striated muscle and the lamina propria

22

what three embryonic tissues interact in the development of the teeth

Ectoderm- which forms the enamel organ
Neural crest and mesoderm give rise to the dental papilla

23

ectoderm forms what part of the teeth? and influences the development?

-enamel organ
- Consists of cells committed to formation of enamel
- Formed from ectoderm under influence of mesoderm and neural crest

24

Neural crest and mesoderm give rise to dental _____. Which is

Dental papilla
- dentin
- Cementum
- Pulp
- surrounding CT and periodontal pulp

25

________ is formed from basal cells of the oral ectoderm

dental primordium

26

The _________ is an epithelial shelf that grows from the thickened primordial into mesenchyme as a bifid structure

labiodental lamina

27

The external limb splits later to form a groove that deeps to separate the _____ and the remainder of the _____

lip, mouth

28

In the development of the teeth the internal limb is the

dental lamina

29

in the development of teeth cells proliferate to form the _______ in each half-jaw

tooth buds (germs)

30

In the development of teeth a second set of tooth-buds develops on the _____ side of each developing deciduous tooth plus three more ______ in each half-jaw

lingual, posteriorly