Carniofacial embryology Flashcards
1
Q
When do the head and neck develop?
A
during 4-8 from an embryonic structure called the pharyngeal or branchial apparatus. The word branchial is sometimes used as this structure also forms the gills in fish. In humans, we used the word pharyngeal, as the pharynx is the crainial end of the foregut.
2
Q
What are the three componenets of the pharyngeal apparatus?
A
Arches, cleft and pouches. Five pairs of pharyngeal arches from starting on day 22. They are separated by externally externally by grooves called pharyngeal cleft and internally by pharyngeal pouches (endoderm). The pharyngeal arches are number 1-4, and 6. The fifth arch does not develop in humans. The pouches and cleft are numbered 1-4.
