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Embryo a arch

Arches, pouches, clefts

Anterior extensions of dorsal aortae into head Distal 2/3 of ICA
Aortic sac of truncus arteriosus External carotid arteries
1st aortic arch Regresses at 4 weeks (small portion forms part of maxillary artery)
2nd aortic arch Regresses (except for very small amount which forms stapedius and hyoid arteries)
3rd aortic arch Common carotid arteries and proximal 1/3 of ICA
Left 4th aortic arch Part of arch of aorta, btwn left common carotid and left subclavian aa
Right 4th aortic arch Proximal part of right subclavian
5th aortic arch Transient
Proximal left 6th aortic arch Proximal part left pulmonary artery
Distal left 6th aortic arch Ductus arteriosus
Proximal right 6th aortic arch Proximal right pulmonary artery
Distal right 6th aortic arch Regresses
Left subclavian artery forms from Left 7th intersegmental artery
Right subclavian artery forms from Proximal: right 4th aortic arch Distal: right 7th intersegmental
Aortic sac of truncus arteriosus forms Brachiocephalic artery, proximal arch of aorta
What forms arch of aorta Aortic sac of truncus arteriosus, left 4th aortic arch, left dorsal aorta
1st pharyngeal pouch Tubotympanic recess--forms middle ear and auditory tube
2nd pharyngeal pouch Tonsilar fossa and palatine tonsils
Dorsal 3rd pouch Inferior parathyroid
Ventral 3rd pouch Thymus
Dorsal 4th pouch Superior parathyroid
Ventral 4th pouch Ultimobranchial body
1st pharyngeal cleft External auditory meatus, outer ectodermal eardrum
2nd, 3rd, 4th clefts No derivatives
What happens to clefts 2,3,4 2nd arch grows caudally, overlaps 3,4; fuses with epicardial ridge, forming cervical sinus.
Created by: cooandrew