Embrology
Terms
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- Limbs buds appear and finger and toes form
- 6-8 weeks; 2 mo.
- Head enlarges quickly and occupies almost half of the body
- 6-8 weeks, 2 mo.
- eyes, ears, and nose appear
- 6-8 weeks; 2 months
- Tail disappears
- 6-8 weeks, 2 months
- all major organs are in place by the end of this month
- 2 month
- Bone formation begins
- 8 weeks
- weak muscle contraction occur
- 8 weeks
- limbs are complete
- 8 weeks
- cardiovascular system is fully functional
- 8 weeks
- Skin of epidemeris and dermis is obvious
- 9-12; 3 month
- Blood cell formation begins in bone marrow ( also in liver and spleen)
- 9-12 weeks, 3 month
- Notochord is degenerating and bone formation is accelerating
- 9-12; 3 months
- sex can be determined from the genitals
- 3 months, 9-12 weeks
- Body begins to outgrow head
- 4 month; 13-16 weeks
- Hard plate is fused
- 4 month, 13-16
- most bones are now distinct and joint cavities are apparent
- 4 months; 13-16 weeks
- body first bends forward into the fetal position
- 5 months; 17-20 weeks
- body size and weight substantially increase
- 6-7 months; 21-30 weeks
- Eyes open
- 6-7 months; 21-30 weeks
- Testes reach the scrotum
- 6-7 months, 21-30 weeks
- Fat accumulates in the hypodermis below the skin
- 8-9 months, 30-38 weeks
- Epidermis
- ectoderm
- central nervous system
- ectoderm
- neural crest cells
- ectoderm
- sensery nerve cells,
- neural crest cells, ectoderm
- pigment cells
- neural crest cells, ectoderm
- bones of the face
- neural crest cells, ectoderm
- hair, finernails, oil glands, swear glands, toenails
- epidermis, ectoderm
- spinal cord
- cns, ectoderm
- brain
- cns, ectoderm
- inner epithelium lining of digestive tube, respiratory tubes, bladder
- Endoderm
- secretory cells (liver and pancreas)
- endoderm
- Notocord
- Mesoderm
- nucleus Pulposus; springy cores of the disc btwn the vertebrae
- notocord; mesoderm
- Sclerotome, dermatome, mytome
- somites, mesoderm
- vertebrae and ribs
- sclerotome, mesoderm
- migrates medially
- sclerotome
- somite located externally
- dermatome
- dermis of skin on the dorsal part of the body
- dermatome, somite, mesoderm
- grow ventrally forming segmented truck musculature of the body wall
- mytome, somite, mesoderm
- limb buds
- mytome, somite, mesoderm
- limb musculature
- mytome, somites, mesoderm
- forms the kidneys and gonads
- intermediate mesoderm
- heart & blood vessel
- splanchnic mesoderm
- surrounds the gut
- splanchnic mesoderm
- gives rise to the wall of the digestive tube (musculature and visceral serosa) not inner epithelial lining
- splanchnic mesoderm
- external coelom
- somatic mesoderm
- parietal serosa
- somatic mesoderm
- dermis of the skin
- somatic mesoderm
- bone
- somatic mesoderm
- ligaments
- somatic mesoderm
- dermis of limb
- somatic mesoderm
- dermis of skin
- somatic mesoderm