Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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
|