Note:The limb buds first appear around 4 weeks after fertilization. These humble buds will give rise to complete fingers and toes, elbows and knees, and arms and legs—all in the next three to four weeks!
1. right upper limb
3. right lower limb bud with marginal vein
4. tip of lower spine (caudal eminence)
5. umbilical vein within umbilical cord
|All ages referenced to fertilization, not last menstrual period.|