Pharyngeal arches and pouches

pharyngeal arches and pouches by DR Nighat shafiq

1. Pharyngeal arches and pouches Dr Nighat Shafiq

2. Formation of head

3. Pharygeal arches They are 6 mesodermal thickenings They appear in the 4 th and 5th weeks. • Arches are covered with ectoderm (externally) and lined with endoderm (internally). Arches are separated from each other by 4 clefts Arches are separated from each other by 5 pouches.

4. Components of pharyngeal arch Each arch is composed of mesodermal ( mesenchymal ) cells that give rise to bones, cartilages and muscles. Each arch has an arterial supply which is called aortic arch. Each arch has a cranial nerve.

5. Development of face

6. Development of palate

7. Development of tongue

8. Tongue

9. Development of maxilla

10. Foramen cecum

11. Development of mandible

12. Development of mandible Primary cartilage Secondary cartilage