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;
10 Cards in this Set
- Front
- Back
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. |