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10 Cards in this Set
- Front
- Back
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Cleavage
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-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) |
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Gastrulation
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Gastrula - three-layered cell:
1. Ectoderm 2. Endoderm 3. Mesoderm |
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Ectoderm
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Hair, nails, nose, mouth, anal canal, lens of eye, retina, and nervous system
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Endoderm
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Linings of digestive tract and respiratory tract, liver, pancreas, thyroid, bladder lining
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Mesoderm
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Musculoskeletal system, circulatory system, excretory system, gonads
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Neurulation
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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. |
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Internal development
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Body organs form, organs increase in size, and then egss development in women and sperm develop in men.
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First trimester
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-Major organs develop
-Eyes, gonads, limbs, liver form -Bone forms |
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Second trimester
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-Lots of growing
-Human face |
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Third trimester
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-Brain development
-Antibodies transported from mom to baby. |
