Histo 2 Flashcards
Types of Epithelium in the Nasal Cavity
Stratified squamous, olfactory, respiratory
Types of Epithelium in the Paranasal Sinus
Stratified squamous, respiratory
Types of Epithelium in the Nasopharynx
Stratified squamous, respiratory
Types of Epithelium in the Larynx
Stratified squamous, respiratory
Types of Epithelium in the Trachea
Respiratory
Types of Epithelium in the Bronchus
Respiratory
Types of Epithelium in the Bronchioles
Ciliated
Types of Epithelium in the Terminal Bronchioles
Bronchiolar
Explain the progressive transition of the respiratory tract.
What type of cartilage is in the trachea?
hyline cartilage
Tubuloacinar glands in the trachea
secretes proteolytic and mucolytic enzymes, number diminishes as you go down the trachea
Do rabbits have any tubuloacinar glands in their trachea?
no
Layers of Tubular Organs with a muscularis muscosa
- Epithelium (of the lumen)
- Lamina Propria
- Muscularis Mucosa
- Submucosa
- Muscularis Externa
- Adventitia OR Serosa
Layers of Tubular Organs without a muscularis mucosa
- Epithelium
- Propria submucosa
- Muscularis Externa
- Adventitia OR Serosa
Histologically, how do you see if a tubular organ has a muscularis mucosa?
look for layer of smooth muscle near the lumen
Can you differentiate the bronchus and trachea histologically?
not well, will generally find more sooth muscle around the bronchus, bronchus has smaller diameter
How do you tell histologically when you’ve gone from bronchus to bronchioles?
there is no hyaline cartilage in the bronchioles
Does the trachea have a muscularis mucosa?
no
Does the bronchus have a muscularis mucosa?
yes
BALT
bronchus asssociated lymphatiic tissue
Bronchiolar epithelium
columnar –> cuboidal, includes ciliated cells
Club cells
bronchiolar exocrine cells which replace goblet cells deeper in the respiratory tract
At what part of the respiratory tract do we get to the respiratory system (site of gas exhange)?
respiratory bronchioles
What species don’t have respiratory bronchioles?
humans and small rodents (they go straight from bronchiole to alveolar ducts)
