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Fetal-postnatal derivatives
 
Fetal structure
Postnatal derivative
Left umbilical vein Ligamentum teres (contained in falciform ligament)
Right and left umbilical arteries Medial umbilical ligaments
Ductus arteriosus Ligamentum arteriosum
Ductus venosus Ligamentum venosum
Foramen ovale Fossa ovale
Allantois/urachus Median umbilical ligament
Notochord Nucleus pulposus of intervertebral disk

 

Aortic arch derivatives
 
Arch 
Derivative
1st 
  • Part of maxillary artery branching from external carotid
2nd
  • Stapedial artery and hyoid artery
3rd
  • Common carotid arteries and proximal part of internal carotid arteries
4th
  • On left, aortic arch
  • On right, proximal part of right subclavian artery
5th
  • Degenerates during development
6th
  • Proximal part of pulmonary arteries
  • Ductus arteriosus

 

 

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