Department of Histology and Embryology, P. J. Šafárik University, Medical Faculty, Košice Respiratory system, development and microscopic structure: Sylabus for foreign students Author: prof. MUDr. Eva Mechírová, CSc. –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Development of respiratory system – 4th week
Development of the lungs 1. The pseudoglandular period (4 -17 week) - bronchi 2. The canalicular period
(16-25 week) - bronchiols
3. The early alveolar period (24 week to birth) - alveoli 4. The late alveolar period (up to 8 years ) – alveoli
Microscopic structure of the respiratory system From the functional point of view the respiratory system comprises :
conducting portion – nasal cavity – paranasal sinuses – nasopharynx – larynx – trachea – bronchi – bronchioles – terminal bronchioles respiratory portion - respiratory bronchioles - alveolar ducts - alveolar sacs - alveoli
Nasal cavity
