Term
| Where does the ectodrem originate from? |
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Definition
| the epiblast layer of the bilaminar disc |
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Term
| What is the morphology of the ectoderm? |
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Definition
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Term
| What does the ectoderm eventually form? |
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Definition
1.epidermis
2.sensory epithelium of the eyes, ears, nose, nervous system, neural crest cells
3.mammary and cutaneous glands |
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Term
| Where does the mesoderm originate from? |
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Definition
| migrating cells of epiblast layer-primitive streak |
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Term
| What does the mesoderm eventually form?(8) |
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Definition
1.dermis
2.muscle
3.bone
4.lymphatics
5.blood cells
6.bone marrow
7.cartilage
8.reproductive and excretory organs |
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Term
| What does the endoderm originate from? |
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Definition
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Term
| What is the morphology of the endoderm? |
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Definition
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Term
| What does the endoderm form? |
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Definition
1.respiratory and digestive system linings
2.liver cells
3.pancreatic cells |
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Term
| Where do neural crest cells originate? |
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Definition
| from migrating neuroectoderm |
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Term
| What do the neural crest cells eventually form? |
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Definition
1.portions of nervous system
2.pigment cells
3.connective tissues proper
4.cartilage
5.bone
6.certain dental tissues |
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Term
| In what period is the embryo most susceptible to birth defects? |
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Definition
| the embryonic period during differentiation and morphogenesis |
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Term
| How many people are born with birth defects or congenital malformation? |
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Definition
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Term
| What can cause birth defects? |
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Definition
genetic or environmental factors which can include...
disturbances during meiosis, implantation, or embryonic and fetal periods |
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Term
| In week 1 the zygote changes to what? |
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Definition
| morula(ball of cells) and then the blastocyst |
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Term
| The blastocyte has what two layers? |
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Definition
| trophoblast(on outside), embryoblast(inside) |
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Term
| What happens to the embryoblast in week 2? |
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Definition
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Term
| What are the two layers of the bilaminar disc? |
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Definition
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Term
| What happens to the bilaminar disc(epiblast, hypoblast) in week 3? |
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Definition
| they form a trilaminar disc by a primitive streak(notocord) |
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Term
| What are the 3 layers of the trilaminar disc? |
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Definition
1.ectoderm-was eepiblast
2.mesoderm-from primitive streak
3.endoderm-was hypoblast |
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Term
| What are the two ends of the trilaminar disc? What do they form? |
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Definition
1.cephallic end(opopharyengeal membrane)- forms throat
2.caudal end (colical membrane)- forms anus |
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Term
| Where does the neural plate form? What are the cells made from this? |
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Definition
| top of mesoderm, neuroectoderm |
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Term
| What does the neural plate form? |
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Definition
| the neural groove which then forms the neural tube |
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Term
| What develop in the neural tube? |
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Definition
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Term
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Definition
| the trilaminar disc folds, endoderm on the inside, with cephallic and caudal ends, face and neck begin to develop |
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