SM 151a - Lung Anatomy and Histology Flashcards
Images taken from Dr. Cochard's SM 151a - Lung Anatomy and Histology lecture slides
What cells reduce surface tension in bronchioles?
Club cells
What is an acinus?
The portion of the lung supplied by a terminal bronchiole
When does lung epithelium begin to differentiate from simple cuboidal epithelium?
During the pseudoglandular period (6-16 weeks)
The costodiaphragmatic recess extends ____ ribs below the lung margins to rib ____ posteriorly and rib ____ anteriorly
The costodiaphragmatic recess extends 2** ribs below the lung margins to rib **12** posteriorly and rib **10 anteriorly
Which structure leaves the impression indicated by arrow #3?
Esophagus
(This is the right lung)
What is the highest intercostal space a needle could be inserted laterally into the thorax and miss the lung tissue?
8th
What kind of epithelium is found in the bronchi?
Pseudostratified columnar epithelium
What kind of epithelium is found in the trachea?
Pseudostratified columnar epithelium
Where is the most proximal part of the airway in which gas exchange can occur?
Respiratory bronchioles
When is the pseudoglandular period of embryonic lung development?
What is occurring?
6-16 weeks
- Airway resembles an exocrine gland
- Branching to terminal bronchiles
- Epithelium begins to differentiate
- Blood vessels elaborate
When in embryonic development does the laryngeotracheal diverticulum (lung bud) appear?
4-5 weeks
When is the alveolar stage of lung development?
What is occurring?
32 weeks - 8 years
- Alveoli and acni continue to develop
- More generations of airway branching continue
- Only 1/2 of adult alveoli are present at birth
Each tertiary bronchi supplies a ______________.
Each tertiary bronchi supplies a bronchopulmonary segment.
During the embryonic period, what kind of epithelium is present in the lung bud?
Undifferentiated simple cuboidal
When is the sacular (terminal sac) stage of embryonic lung development?
What is occuring?
26 weeks - birth
Alveolar epithelium differentiates into type I and type II pneumocytes
Type II pneumocytes begin to produce surfactant