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Respiratory system - Coggle Diagram
Respiratory system
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Trachea formation
2- Tracheoesophageal septum:
- Dorsal portion = esophagus
- Ventral portion = Trachea & lung buds
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Larynx formation
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Nerves
- Superior laryngeal → 4th Pharyngeal arch
- Recurrent laryngeal → 6th Pharyngeal arch
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Trachea, Bronchi & Lungs
5th week → Buds enlarged:
- Right main bronchi → 3 secondary bronchi
- Left main bronchi → 2 secondary bronchi
Secondary bronchi:
- Right → 10 tertiary bronchi
- Left → 8 tertiary bronchi
⇔ Bonchopulmonary segment
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Branching is regulated by → Epithelial-mesenchymal interactions between:
- Endoderm of lung buds
- Spachnic mesoderm
- Outside mesoderm → Visceral pleura
- Somatic mesoderm layer → Parietal pleura
- Space between the 2 pleuras → Pleural cavity
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Endodermal origin
Epithelium of:
- Trachea
- Larynx
- Bronchi
- Lungs
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