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10 Cards in this Set

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Cleavage
-Early embryonic development; series of mitotic divisions

-increase cell number while the cytoplasm remains constant.

Order of division:
Morula - Solid ball of embryonic cells
Blastulation - morula develops a fluid-filled cavity and then becomes hollow (blastula)
Gastrulation
Gastrula - three-layered cell:
1. Ectoderm
2. Endoderm
3. Mesoderm
Ectoderm
Hair, nails, nose, mouth, anal canal, lens of eye, retina, and nervous system
Endoderm
Linings of digestive tract and respiratory tract, liver, pancreas, thyroid, bladder lining
Mesoderm
Musculoskeletal system, circulatory system, excretory system, gonads
Neurulation
After gastrulation, germ layers develop into a nervous system (simple).

The notochord (mesodermal cells) - causes the ectoderm to bend inward to form a groove on the dorsal surface. Neural folds form to give rise to brain and spinal chrod.
Internal development
Body organs form, organs increase in size, and then egss development in women and sperm develop in men.
First trimester
-Major organs develop

-Eyes, gonads, limbs, liver form

-Bone forms
Second trimester
-Lots of growing

-Human face
Third trimester
-Brain development

-Antibodies transported from mom to baby.