Nasal + Oral Cavity Flashcards Preview

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Flashcards in Nasal + Oral Cavity Deck (24):
1

Nasal cavity: gross anatomy

olfactory chemoreceptors in olfactory epithelium --> cribiform plate --> olfactory bulb --> limbic system

2

types of cells in the olfactory epithelia (3)

olfactory chemoreceptors, support cells, basal cells

3

molecular mechanism of smell

odourant --> GPCR --> up adenyl cyclase/cAMP --> open Na channel

4

nasal cavity consists of both what kinds of epithelia?

olfactory + respiratory epithelia

5

name the cells in the respiratory epithelia (5)

cilliated pseudostrat columnar epithelial cells, goblet cells, basal cells, brush cells, K cells

6

name the parts of the oral cavity (5)

oral epithelium, tongue, tonsils, teeth, salivary glands

7

name the features of the lip slide (oral epithelium). Name the 3 zones and their epithelial characteristics

exterior (will see hair follicles, sebaceous glands + keratinized simple squamous epith).

vermillion zone (will see transition bw keratinzed simple squamous epith --> nonkeratinzed simple squamous epith. This area has no sebaceous or sweat glands -- chaps easily)

interior (nonkerat simple squamous epithelia, minor salivary glands) Note that the middle has skeletal muscle

8

The tongue is a bag of muscles covered in oral epithelium + papillae. Name the 3 types of papilae and their features

1) filiform (most common, spiky looking, keratinized (grey/white), helps move food along)

2) fungiform (rounder, well vascularized/innervated, lightly keratinized)

3) circumvallate (8-10 along the sulcus terminals. responsible for taste. V large, circular papillae with a deep groove/"moat". On the side of the papillae are VON EBNER'S GLANDS which secrete SEROUS MUCUS into the groove. This dissolves tastants, for the TASTE BUDS on the side of the papillae to detect (can only detect AQUEOUS things)

9

describe the histology of a taste bud

consists of a taste pore opening into a series of TASTE HAIR CELLS, SUPPORT CELLS, BASAL CELLS , and innervated by an afferent nerve fibre

10

what kind of tissue are tonsils?

lymphoid tissue

11

name the 2 tonsils we are responsible for knowing

palatine (back of throat) and pharengeal (up in nasopharynx)

12

slide of a palatine tonsil - what are its distinguishing characteristics?

1) dense CT capsule with CRYPTS
2) covered in oral epithelium (nonkerat simple squamous)
3) contain LYMPHATIC NODULES (pale blobs) which contain IMMATURE, DIVIDING B CELL LYMPHOCYTES

13

Name the gross anatomy layers of a tooth (3+1)

1) enamel, 2) dentin, 3) pulp, 4) roots

14

what 2 things hold a tooth in place?

cementum + periodontal ligament (hold dentin root --> bone)

15

histological layers of an erupting tooth (from out to in)

ameloblast, enamel, dentin, predentin, odontoblast, pulp

16

what secretes what in a tooth? ie logic to the layers

ameloblasts secrete enamel, odontoblasts secrete predentin, which matures into dentin (leaving dentin tubules which form from odontoblast processes)

17

what makes cementum

cementocytes

18

what is enamel made of? wha tproteins are invlved in enamel formation

amelogenins, enamelinins

19

what is dentin made of

collagen + hydroxypatite

20

name the 3 salivary glands

parotid, sublingual, submandibular

21

what secretes what kind of saliva?

parotid secretes serous saliva (w/ amylase)

sublingual secretes seromucus (mostly mucus) saliva w/ lysozyme

submandibular secretes seromucus saliva

22

describe the path of saliva (5)

secreted by serous/mucus epithelial cells --> acini --> secretory tubules --> intercalated duct (cuboidal epithelium) --> stirated duct (columnar epithelium w/ basal membrane infoldings) --> excretory duct

note that the acinus is covered in myoepithelial cells

23

how to distinguish bw serous and mucous ducts?

serous: pink, pyramidal, pizza shaped, found in acini

mucus: pale, pizza shaped, larger duct lumen, found in tubules

24

how to tell what is a striated duct?

apically located nuclues, striped, looks really weird