DSA: Histo: Nasal cavity, larynx, pharynx

Question 1

what makes up conducting portion?

Answer 1

respiratory epithelium (ciliated pseudostrat. columnar epithelium w/ goblet cells)

• glands are located in lamina propria
• contains smooth m.
• elastic fibers and cartilage

Question 2

what does terminal conduction portion appear as?

Answer 2

• cilia, glands, cartilage gradually disappear
• smooth m. increases
• eptihelium becomes cuboidal

Question 3

what portions are considered “conducting”?

Answer 3

nose, nasopharynx, larynx, trachea

Question 4

2 parts of nasal cavity?

Answer 4

1. vestibule (passageway for air)

2. respiratory

Question 5

what makes up vestibular portion of nasal cavity?

Answer 5

• stratified squamous keratinzed epithelium w/ hair follcles

- gradually changes to resp. epithelium (ciliated pseudostratified columnar with goblet cells)

Question 6

makes up respiratory portion of nasal cavity?

Answer 6

• thick BM

- layer of CT below BM called “lamina propria” which contains mucous glands, plexus of vv

Question 7

olfactory region of nose?

Answer 7

located in resp. portion of nasal cavity
- covered w/ olf. epithelium (pseudostrat. columnar w/ goblet cells)

• in subepithelium are tubulo-alveolar glands of Bowman that secrete fluids on surface to trap odorous substances

Question 8

what cells are in olfactory region?

Answer 8

bipolar neurons (olfactory cells) - axons project through cribiform plate to olfactory bulbs to synapse.

sustentacular cells = supporting cells

basal cells = regenerative cells

Question 9

uvula

Answer 9

• posteiror most extension of soft palate
• stratified squamous noncornified epithelium
• located in naso/oropharynx

Question 10

nasopharynx

Answer 10

proximal most portion (nasal region) lined with resp. epithelium

distal portion (oral region) lined with strat. sq. non-keritonized epi ad continuous with oropharynx

Question 11

auditory ube

Answer 11

eustacian tube is lined with resp epithelium (w/ numerous goblet cells)
- connected to middle ear and nasopharynx, allows for equalization of pressure b/w tympanic cavity and external auditory meatus

Question 12

epiglottis of larynx: two surfaces?

Answer 12

“lid” of larynx

• elastic cartilage with mixed seromucous glands present
  1. ant surface = stratified squamous non-keratinized (w/ taste buds)
  2. post surface = respiratory epithelium

Question 13

what is resp. epithelium?

Answer 13

ciliated pseudostrat. columnar epithelium w/ goblet cells

Question 14

vocal folds

Answer 14

• false cords and true folds covered by resp. epithelium = stratified sqaumous nonkeratined
• form the space of the ventricle