Download - BIO 241 HISTOLOGY REVIEW Respiratory System Dr. Tim Ballard Department of Biology and Marine Biology
BIO 241 HISTOLOGY BIO 241 HISTOLOGY REVIEWREVIEW
Respiratory SystemRespiratory System
Dr. Tim BallardDr. Tim Ballard
Department of Biology and Marine BiologyDepartment of Biology and Marine Biology
TracheaTrachea
Trachea –section – H&E – 4x objective
lumen
ciliated pseudostratified columnar epithelium
submucosa C-shaped ring of hyaline cartilage
esophagus
The arrowhead indicates the trachealis muscle, which bridges the open ends of the C-shaped cartilage ring.
TracheaTrachea
Trachea –section – H&E – 10x objective
lumen
ciliated pseudostratified columnar epithelium
submucosa
hyaline cartilage
adventitia
adipose tissue
Although not shown in this view, goblet cells should be seen easily scattered throughout the epithelial layer.
TracheaTrachea
ciliaTrachea –section – H&E – 40x objective
ciliated pseudostratified columnar epithelium
submucosa
hyaline cartilage
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.
Intrapulmonary bronchusIntrapulmonary bronchus
Intrapulmonary bronchus – cross section – H&E – 10x objective
lumen
ciliated pseudostratified
columnar epithelium
alveoli
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.
BronchioleBronchiole
Bronchiole – cross section – H&E – 4x objective
The star shows a bronchiole. Note that there are no plates of cartilage around it.
BronchioleBronchiole
Bronchiole – cross section – H&E – 10x objective
smooth muscle
Note the change in the epithelium to a short columnar/cuboidal with no goblet cells. Cilia are still present.
BronchioleBronchiole
Bronchiole – cross section – H&E – 40x objective
ciliated simple columnar epithelium
Arrows indicate alveoli arises directly from the respiratory bronchiole. There is simple squamous epithelium and some smooth muscle. PA=pulmonary artery
Respiratory bronchioleRespiratory bronchiole
Respiratory bronchiole – cross section – H&E – 10x objective
respiratory bronchiole
AlveoliAlveoli
Respiratory bronchiole – cross section – H&E – 10x objective
alveolar sac
alveolar wall