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21 Cards in this Set

  • Front
  • Back
_ give rise to laryngeal cartilage
Neural crest cells (ectoderm)
_ make cartilages and smooth muscle of airway
Splanchnic mesoderm
_ make skeletal muscle of larynx
Somitomeres
_ makes epithelial lining and glands
Endoderm
_ separates lung buds from foregut
Esophagotracheal ridges
_ separates trachea and lung buds from esophagus
Esophagotracheal septum
The epithelim of the larynx originates from?
Endoderm
Neural crest cells give rise to
Laryngeal cartilages
Cricothyroid muscle comes from what arch and innervation
4th arch, superior laryngeal nerve
All laryngeal muscles except cricothyroid arise from what arch and innervation
6th arch, recurrent laryngeal nerve
All laryngeal muscles are innervated by _
Vagus nerve
Separates true and false vocal folds
Laryngeal ventricles
Epithelium of trachea and bronchi are derived from _
Endoderm
_ forms tracheal and bronchial cartilage and smooth muscle
Splanchnic mesoderm
Describe embryonic stage of lung development
First stage begins during weeks 4-7 as lungs grow into intraembryonic coelom and become situated in pleural cavity. During this period airway divides into primary, secondary and tertiary bronchi. At this time there are definitive differences between right and left primary bronchi
Describe pseudoglandular stage of lung development
This stage occurs during weeks 8-16, lungs are continuing to grow into pleural cavities. At this time there are terminal bronchioles present but no gas exchange structures are present
Describe canalicular stage of lung development
This stage occurs during weeks 16-25 weeks and is characterized by presence of respiratory bronchioles and alveolar ducts. During the later weeks of this phase gas exchange is possible
Describe terminal sac stage of lung development
This phase begins approximately week 24 and continues until birth. Realize that there is some overlap with the stages. During this stage the epithelium becomes thin and forms type I alveolar cells and the capillaries bulge into alveolli. Near end of this stage type II alveolar cells begin to produce surfactant. The secretion of surfactant is essential to gas exchange
Describe alveolar stage of the lung development
This stage begins near birth and ocntinues until approximately 8 years of age. During this stage (after birth) the mature alveoli form. During this period the number of alveoli increases and the size of the alveoli increases
Cause of esophageal atresia
Results from abnormal partitioning of esophagus and trachea and involves narrowing or closure of esophagus
Respiratory distress results from _
Insufficient surfactant - this causes alveoli to collapse during expiration