BIO 241 HISTOLOGY REVIEW Respiratory System

1
BIO 241 HISTOLOGY REVIEWRespiratory System
Dr. Tim Ballard Department of Biology and Marine
Biology
2
Trachea
Trachea section HE 4x objective
C-shaped ring of hyaline cartilage
submucosa
lumen
esophagus
ciliated pseudostratified columnar epithelium
The arrowhead indicates the trachealis muscle,
which bridges the open ends of the C-shaped
cartilage ring.
3
Trachea
Trachea section HE 10x objective
ciliated pseudostratified columnar epithelium
adventitia
submucosa
lumen
hyaline cartilage
adipose tissue
4
Trachea
Trachea section HE 40x objective
cilia
ciliated pseudostratified columnar epithelium
submucosa
hyaline cartilage
Although not shown in this view, goblet cells
should be seen easily scattered throughout the
epithelial layer.
5
Intrapulmonary bronchus
Intrapulmonary bronchus cross section HE
10x objective
ciliated pseudostratified columnar epithelium
lumen
alveoli
The arrow shows a plate of cartilage, not a
C-shaped ring. This is a diagnostic feature of
this type of bronchus. Very little smooth muscle
is present.
6
Bronchiole
Bronchiole cross section HE 4x objective
The arrow shows a bronchiole. Note that there
are no plates of cartilage around it. The
arrowhead points out a branch of the pulmonary
artery.
7
Bronchiole
Bronchiole cross section HE 10x objective
smooth muscle
The star shows a bronchiole. Note that there are
no plates of cartilage around it.
8
Bronchiole
Bronchiole cross section HE 40x objective
ciliated simple columnar epithelium
Note the change in the epithelium to a short
columnar/cuboidal with no goblet cells. Cilia
are still present.
9
Respiratory bronchiole
Respiratory bronchiole cross section HE
10x objective
respiratory bronchiole
Arrows indicate alveoli arises directly from the
respiratory bronchiole. There is simple squamous
epithelium and some smooth muscle. PApulmonary
artery
10
Alveoli
Respiratory bronchiole cross section HE
10x objective
alveolar wall
alveolar sac