Cloned from: Neonatal Test 1



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Embryonic Period is from ____ to _____ and includes:

0-7 weeks,
- Appearance of lung buds (originating from endoderm
outgrowth of foregut)
- Division into major bronchi  (subdivide into lobar bronchi)
Lung growth begins when?
Begins early in fetal life-just before 28 days gestation

Continues until the end of adolescence
Pseudoglandular Period is from _____ to ______ and is characterized by:

7-17 weeks, Rapid branching / Airways lined by columnar epthelial / Appearance of cartilage, lymphatics, mucous glands and muscle cells from 10 weeks/ **
Terminal bronchioles present by 17 weeks
Cannulicular Period is from ____ to ______, and is characterized by:
17-27 weeks, Development of terminal bronchioles, respiratory bronchioles, and small alveolar sacs (acinus) / Differentiation of :
Type 1 Pneumocytes for gas exchange
Type II Pneumocytes for surfactant production
Type 1 Pneumocytes ARE FOR what
Type II Pneumocytes ARE FOR what
(I) for gas exchange
(II) for surfactant production
Saccular period is from ____ to _____, and is characterized by:
27-36 weeks / Enlargement of peripheral airways, Further differentiation of pneumocytes
Alveolar Period includes ______ to ______ and is characterized by:
36 weeks in utero - 2 years post natal,
Alveoli increase in number until 2-4 years of age and continue to increase in size until adolescence / Increase in cartilage, glands, muscles / Adult number of alveoli 300-400 million
Surfactant is a ______ and it is secreted by _______________.  Its job is to _________________. 

Mixture of phospholipids and proteins, Secreted by Type II Pneumocytes, Reduces Surface tension.
x of y cards