Respiratory Development Flashcards
Name of lung bud that appears as an outgrowth
Respiratory Diverticulum
What makes up the inner lining of larynx, trachea, bronchi, and lungs?
Endoderm
What makes up the cartilaginous, muscular, and connective tissue components of the trachea and lungs?
Splanchnic mesoderm
What separates the lung bud from the foregut?
Tracheoesophageal ridges which fuse to form the tracheoesophageal septum
Abnormalities in partitioning of esophagus and trachea by tracheoesophageal septum results in?
Esophageal Atresia (w/ or w/o tracheoesophageal fistulas)
Mesenchyme of the 4th and 6th arch transorm into?
- Thyroid Cartilge
- Cricoid Cartilage
- Arytenoid Cartilage
This forms from the mesenchyme of the caudal hypopharyngeal eminence
Epiglottis
Muscles from the 4th and 6th arch are innervated by:
4th: Superior laryngeal n.
6th: Recurrent laryngeal n.
VAGUS NERVE
How many secondary and tertiary bronchial buds does the right and left form?
Right: 3 secondary 10 tertiary
Left: 2 secondary 8 tertiary
What gives rise to visceral and parietal pleura?
Visceral: Splanchnic Mesoderm
Parietal: Somatic Mesoderm
What is considered end of the conducting division?
Terminal Bronchioles
What is the start of respiratory division?
Respiratory bronchioles
Branching has continued to form terminal bronchioles. No respiratory bronchiles or alveioli are present.
Pseudoglandular Period (5-16wks)
Each terminal bronchiole divides into two or more respiratory bronchioles, which in turn divide into three to six alveolar ducts.
Calalicular Period (16-26wks) **Can only survive if born at end of this**
Terminal sacs (primative alveili) form, and capillaries establish close contact
Terminal Sac Period (26wk-birth)
