Respiratory Histology Flashcards
Most respiratory tract epithelium
pseudostratified ciliated columnar epithelium
Sustentacular cells
columnar cells
physical support and nourishment
Epithelium in
nasopharynx
oropharynx
layngeal pharynx
naso: respitatory
oro: stratified squamous
laryngeal: stratified squamous
Hyaline cartilages
thyroid
cricoid
tracheal rings
Elastic cartilages
epiglottis
Epiglottis epithelial covering
superior: stratified squamous
inferior: pseudostratified ciliated columnar
Trachea mucosa
distringuishing feature
very thick basement membrane
Ciliated columnar cells
functions
move mucus
Cross sectional area at each branch point…
increases
Basal cells
function
divide to replenish goblet, ciliated columnar
IgE receptors found on
mast cells
basophils
Basal cells
pyramidal cells
replace sustentacular cells and olfactory cells
Bronchus vs bronchioles
bronchi have cartilage
Epithelium in bronchioles
ciliated simple columnar with occassional goblet cells
Clara cells found in
bronchioles
Opening of each alveolus controlled by
single sm muscle cell
contraction may reduce size
Alveolar pores
help to regulate pressure differences between alveolar sacs
Collagen in alveoili
type III collagent
Goblet cells function
secrete mucus
Type I vs type II pneumocytes
numbers
II > I
but I are huge, cover 95% of alveolar surface
Beginning of respiratory portion
respiratory bronchioles
Clara/club cell function
secrete glycoprotein
prevents collapse
degrade inhaled toxins via CYP450s
divide to regenerate bronchiolar epithelium
Epiglottis cartilage
elastic
Type II pneumocyte
epithelium type
cuboidal
