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54 Cards in this Set

  • Front
  • Back
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
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