Term
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Definition
| study of prenatal development |
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Term
| what cause congentical malformation |
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Definition
|
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Term
| some known teratogens are |
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Definition
ethanol
tetracycline
phenytoin (dilantin)
warfarin//coumadin
rubella
herpes simplex
hiv
syphilis
radiation |
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Term
| when do most developmental disturbances happen |
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Definition
| in preimplantation and the embryonic period |
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Term
| the 1st week of prenatal development is called |
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Definition
preimplantation period
unattached
ovum is penetrated with sperm and fertilization happens |
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Term
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Definition
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Term
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Definition
ovum and sperm join
23 from each mom and dad
46 are shuffled together and only half are used |
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Term
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Definition
| reproduction of new set of chromosomes |
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Term
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Definition
a clump of cells due to secretion of fluid after mitosis
it continues to divide into blastocysts and blastula |
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Term
| where does the blastocyst travel to |
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Definition
| from site of fertilization to uterus |
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Term
| when does the blastocyst stop traveling to uterus |
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Definition
the end of 1st week
then it is implanted |
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Term
| what is the outer layer of the blastocyst |
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Definition
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Term
| what is the small inner layer of the blastocyst |
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Definition
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Term
| which layer will provide prenatal support to the blastocyst |
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Definition
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Term
| the embryoblast layer later becomes |
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Definition
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Term
| when there is an extra chromosome 21 it is called trisomy what does this cause |
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Definition
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Term
someone with broad face, wide set eyes
a flat bridge nose, oblique eye fissures, and a furrowed lower lip and fissures probably has what disease>? |
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Definition
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Term
| what occlusion is common for down's syndrome? |
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Definition
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Term
| what do you call the primitive mouth |
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Definition
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Term
| what is the name of the clump of cells created by the union of sperm and egg within the first few hours? |
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Definition
Zygote
then becomes morula
then blastocyst
then blastula |
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Term
| what are the initial 2 layers which will later become the embryo? |
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Definition
| the epiblast and the hypoblast |
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Term
| what are the 3 layers which have evolved from the first two layers (epiblast and hypoblast)? |
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Definition
| ectoderm, mesoderm, endoderm |
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Term
| how do osteoporosis drugs work |
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Definition
| they deactivate the osteoclasts thus making osteoblasts the only workers, this can make for dense bone which could cause problems for blood supply and make bone brittle. it can cause necrosis of the bone. |
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Term
| at what point does epiblast and hypoblast present itself? |
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Definition
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Term
| ectoderm, mesoderm and endoderm form when? |
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Definition
3 weeks
folding happens at 3-4 weeks |
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Term
| what becomes the buccopharangeal membrane? |
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Definition
| the ectoderm becomes buccopharangeal membrane. |
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Term
| what is the extra chromosome 21 called |
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Definition
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Term
| what is the time frame of the embryonic period? |
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Definition
| starts in second week ends at the end of week 8 |
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Term
| when does the blastocyst start to become an embryo?> |
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Definition
| second week blastocyst starts to become embryo |
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Term
| what are the stages of the physiological process that changes the blastocyst to embryo? |
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Definition
induction
proliferation
differentiation
morphogenesis
maturation |
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Term
| which phase of physiological process involves interaction between emryological cells, the cells are triggered to develop into structures and is not well understood? |
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Definition
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Term
| what happens during proliferation? |
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Definition
controlled cellular growth and accumulation of by products.
intertitial growth (soft tissue)
appositional growth (bone) |
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Term
in what phase of physiological process do these things occur:
-change in embryonic cells to become distinct structurally and functionality.
-major tissues and organs begin to form specialized cells |
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Definition
|
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Term
| what occurs during morphogenesis? |
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Definition
| development of specific tissue morphology or differing form due to embryonic cell migration and inductive interactions |
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Term
| which stage of physiological process involves attainment of adult function and size due to proliferation, differentiation, and morphogenesis? |
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Definition
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Term
| when is the embryo recognizeably human? |
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Definition
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Term
| during the second week _____ ________ discs are formed |
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Definition
| bilaminar embryonic discs |
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Term
| how many layers does the bilaminar embryonic disc have, explain |
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Definition
2
superior-epiblast
inferior-hypoblast |
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Term
| the bilaminar embryonic discs are set in the uterus's endometrium surrounded by two fluid filled cavities. explain the cavities. |
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Definition
top fluid sac will be placenta
bottom fluid sac provides temporary nourishment |
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Term
the primitive streak forms within the bilaminar disc during week 3. the left and right are identical. bilateral symetry occurs.
true/false |
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Definition
| all statements are true of the primitive streak |
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Term
| during the third week the bilaminar disc thickens and makes a new layer called? |
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Definition
| trilaminar embryonic disc |
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Term
| explain the layers of the trilaminar disc |
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Definition
-epiblast is now ectoderm
-mesoderm is in middle
-hypoblast is now endoderm |
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Term
| what will ectoderm become |
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Definition
|
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Term
|
Definition
| connective tissue, muscle, blood vessels |
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Term
|
Definition
| epithelial linings of respiratory passages and digestive tract |
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Term
| at what point are the two ends recognizeable as cephalic (head) and caudal (tail) |
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Definition
| during the third week head and tail are recognizeable |
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Term
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Definition
| with the cloacal membrane (anus) |
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Term
| where is the neuroectoderm located? |
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Definition
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Term
| when does the CNS begin to form and specialized cells differentiate from ectoderm making the neuroectoderm? |
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Definition
| the third week cns and neuroectoderm begin formation |
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Term
| how long is neuroectoderm? |
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Definition
| the length of embryo cephalic to caudal end |
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Term
| what are the cells that develop in week 3 from the neuroectoderm that will become the face>? |
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Definition
|
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Term
| where do somites develop from? |
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Definition
somites develop from mesoderm
they will be skeletal structure of head, neck, trunk, muscles, and dermis |
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Term
| when does folding happen when tissue forms like a tube>? |
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Definition
|
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Term
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Definition
| after folding a long hollow tube cephalic to caudal will become future GI tract |
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Term
| what is the anterior portion of the tubelike structure |
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Definition
|
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Term
| what is in midgut and hindgut |
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Definition
| face, neck, primitive ears, eyes, nose and oral cavity and jaws |
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