pharyngeal arches and pouches by DR Nighat shafiq

1. Pharyngeal arches and pouches
Dr Nighat Shafiq

2. Formation of head

5. 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.

7. 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.

14. Development of face

17. Development of palate

21. Development of tongue

22. Tongue

23. Development of maxilla

24. Foramen cecum

27. Development of mandible

28. Development of mandible
• Primary cartilage
• Secondary cartilage