Term
| what are the 5 steps that take place in Pre Development? |
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Definition
1. Fertilization
2. Zygote
3. Morula
4. Blastocyst
5. Implantaion |
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Term
| what time frame does PreImplantation fall into? |
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Definition
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Term
| Embryonic Period occurs in what time frame? |
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Definition
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Term
| what months does the Fetal Period take place? |
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Definition
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Term
| What happens to the Zygote to make more of itself? |
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Definition
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Term
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Definition
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Term
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Definition
| a hollow ball with 2 layers |
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Term
| what are the two layers of a blastocyst? |
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Definition
-Trophoblast layer on the outside
-Embryoblast layer on the inside |
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Term
| what happens to the Embryoblast layer cells on the inside? |
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Definition
| they all move to one side of the cell |
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Term
| where does the Blastocyst implant itself? |
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Definition
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Term
| what do the trophoblast cells do during inplantation? |
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Definition
| they digest the uterine wall and insert its own into the wall |
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Term
| what does the Trophoblast layer aid in at the end of preimplantation? |
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Definition
| the rise and support of tissues |
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Term
| what does the embryoblast layer aid in at the end of the preimplantaion period? |
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Definition
| it gives rise to the embryo. |
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Term
| what does the Embryoblast layer do first in the 2nd week? |
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Definition
| It proliferates forming 2 layers |
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Term
| when the embryoblast forms 2 layers what is this called? |
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Definition
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Term
| what two layers make up the Bilaminar Disc? |
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Definition
| Epiblast and hypoblast Layers |
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Term
| what cell type makes up the epiblast layer? |
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Definition
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Term
| what cell type makes up the hypoblast layer? |
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Definition
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Term
| what is on either side of the bilaminar disk? |
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Definition
| 2 fluid filled sacs, the Amniotic membrane and the Yolk sac |
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Term
| what are the 5 Physiological processes that occur during weeks 2-8? |
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Definition
-Induction
-Proliferation
-Differentiation
-Morphogenesis
-Maturation |
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Term
| what is the Induction stage? |
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Definition
| when the cells communicate to let the others know what they will be when the fully develop. |
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Term
| what is the Proliferation sage? |
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Definition
| This is the stage where cellular growth is controlled |
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Term
| what is the differentiation stage? |
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Definition
| This is where cells change to give you different features. |
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Term
| what is happening in the morphogenesis stage? |
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Definition
| the development of specific tissues and systems. |
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Term
| what happens in the maturation stage? |
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Definition
| attainment of becoming adult size. |
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Term
| what happens to the bilaminar disc in week 3? |
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Definition
| a Primitive streak forms seperating the disc in half. |
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Term
| after the Primitive streak divides the disc what new layer is formed? |
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Definition
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Term
| what are the new 3 layers of the Trilaminar disc? |
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Definition
1. Ectoderm
2. Mesoderm
3. Endoderm |
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Term
| what is another word for Primitive streak? |
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Definition
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Term
| As the primitive streak goes down the bilaminar disc, 3 layers are formed..? (these layers will LATER form the trilaminar disc) |
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Definition
1. epiblast layer
2. Migratory cells
3. hypoblast layer |
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Term
| what are the two ends of the trilaminar disk that only have ectoderm and endoderm? |
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Definition
| Oropharyngeal membrane and the Cloacal membrane. |
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Term
| What will the Oropharyngeal and cloacal membrane begin to form eventually? |
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Definition
| The beginning and end of the digestive tract |
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Term
| what system starts to form in week 3? |
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Definition
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Term
| a band of cells that extend from the cephalic to the caudal end grows and thickens forming what? |
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Definition
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Term
| Ectoderm cells along the neural plate differentiate into what? |
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Definition
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Term
| as the Neural plate thickens and grows what happens? |
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Definition
| It causes invagination forming a neural groove. |
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Term
| At the end of the 3rd week the neural groove continues to deepen and during the 4th week what is formed? |
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Definition
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Term
| during the 3rd week where do neural crest cells form from? |
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Definition
| The neuroectoderm (which is the neural plate and the neural groove) |
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Term
| Neural crest cells will migrate into which area after the neural tube is formed? |
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Definition
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Term
| At the end of week 3 the neural tube pintches off and what connects to the mesoderm? |
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Definition
| 38 pairs of somites connect to the mesoderm. |
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Term
| what is the purpose of the week 4 disc folding? |
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Definition
| this tubular embryo and places tissues in their correct position. |
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Term
| extensive folding occurs in the cephalic end, a hollow tube is formed, what tract does this make? |
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Definition
| This hollow tube will form the respiratory to digestive tract. |
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Term
| The face and neck start to develop in what week? |
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Definition
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Term
| What weeks of formation are most important to dental development? |
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Definition
| Facial formations weeks 3-8. |
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Term
| In what weeks does the development of the face and neck take place? |
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Definition
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Term
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Definition
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Term
| what membrane lines the stomodeum and separates the future oral cavity from the future pharynx? |
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Definition
| The Oropharyngeal membrane |
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Term
| what happens when the oropharyngeal membrane ruptures? |
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Definition
| The stomodeum is now continuous withthe pharynx |
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Term
| which grows faster the upper or lower face? |
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Definition
| the upper face grows more rapid |
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Term
| how does the face develop? |
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Definition
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Term
| what will form out of the frontonasal process above the stomodeum? |
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Definition
| the upper face, nose, primary palate, eyes and internal ear. |
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Term
| Below the stomodeum the neck will develop from what? |
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Definition
| The primitive pharynx and Branchial Apparatus |
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Term
| what is included in the Branchial Apparatus? |
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Definition
| Branchial arches, branchial grooves and membranes and pharyngeal pouches |
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Term
| when is the embryo most susceptible to disturbances? |
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Definition
| During the Embryonic period when differentiation and morphogenesis takes place. |
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Term
| what is the statistics for birth defects? |
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Definition
| 1 in 700 births have some congenital malformation or birth defects. |
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