Respiration Lecture 15: Histology Flashcards
respiratory tract
tubular system that extends from nares to lungs
Functions of resp. tract
1) warm/moisten air
2) detect odorant molecules
3) conduct air to lungs
4) gas exchange with blood
5) minimize entry of ingested food and fluid
6) produce vocalizations
7) trap/eliminate foreign particles
8) combat microbes
Type of epithelium in vestibular region
nonkeratinized stratified squamous epithelium
2 types of epithelium in respiratory region
respiratory + olfactory ep.
4 main components of nasal cavity
1) vestibular region
2) respiratory region
3) paranasal sinuses
4) vomeronasal organs
philtrum
area between nostril and mouth
respiratory epithelium =
pseudostratified ciliated columnar epithelium
4 main cell types found in resp. ep.
goblet, ciliated, basal, and brush cells
olfactory epithelium =
pseudostratified ciliated columnar epithelium
3 main cell types found in olfactory ep.
sustentacular, olfactory, and basal cells. NO GOBLET CELLS
where are Bowman’s glands found and what do they do?
Beneath olfactory epithelium; secretion dissolves odor-producing substances
Paranasal sinuses fx
provide thermal and mechanical protection to orbits, nasal and cranial cavities; add resonance to vocalizations
T or F: pig has more extensive paranasal sinus than dog
T
What is paranasal sinus lined by?
Resp. ep.
What is vomeronasal organ lined by?
Resp. and Olf. ep., cartilage
vomeronasal organ fx
detect pheromones involved in social and mating behaviors
What is nasopharynx lined by?
resp. ep. (pseudostratified ciliated columbar ep.) Is around the soft palate
What is larynx lined by?
stratified squamous and resp. ep.
Epiglottis is lined by:
Non-keratinized stratified squamous epithelium that interdigitates with the lamina propria
Epithelium in trachea
respiratory ep.
where is trachealis m. in dog vs. ox?
dog-outside smooth muscle ring; ox-inside ring
Tunic layers from inside to outside of tubular organ (4)
1) Tunica mucosa (lines lumen)
2) Tunica submucosa (often contains glands)
3) Tunica muscularis
4) Tunica serosa or adventitia
Main secretory cell type in tracheal epithelum of domestic mammals
goblet cells
lamina muscularis mucosae in trachea contains
elastic fibers