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Clarke- prenatal development
Implantation-Week 4
24
Anatomy
11th Grade
10/19/2012

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Cards

Term
Where does the ectodrem originate from?
Definition
the epiblast layer of the bilaminar disc
Term
What is the morphology of the ectoderm?
Definition
columnar
Term
What does the ectoderm eventually form?
Definition
1.epidermis
2.sensory epithelium of the eyes, ears, nose, nervous system, neural crest cells
3.mammary and cutaneous glands
Term
Where does the mesoderm originate from?
Definition
migrating cells of epiblast layer-primitive streak
Term
What does the mesoderm eventually form?(8)
Definition
1.dermis
2.muscle
3.bone
4.lymphatics
5.blood cells
6.bone marrow
7.cartilage
8.reproductive and excretory organs
Term
What does the endoderm originate from?
Definition
the hypoblast layer
Term
What is the morphology of the endoderm?
Definition
cubodial
Term
What does the endoderm form?
Definition
1.respiratory and digestive system linings
2.liver cells
3.pancreatic cells
Term
Where do neural crest cells originate?
Definition
from migrating neuroectoderm
Term
What do the neural crest cells eventually form?
Definition
1.portions of nervous system
2.pigment cells
3.connective tissues proper
4.cartilage
5.bone
6.certain dental tissues
Term
In what period is the embryo most susceptible to birth defects?
Definition
the embryonic period during differentiation and morphogenesis
Term
How many people are born with birth defects or congenital malformation?
Definition
every 1 in 700
Term
What can cause birth defects?
Definition
genetic or environmental factors which can include...
disturbances during meiosis, implantation, or embryonic and fetal periods
Term
In week 1 the zygote changes to what?
Definition
morula(ball of cells) and then the blastocyst
Term
The blastocyte has what two layers?
Definition
trophoblast(on outside), embryoblast(inside)
Term
What happens to the embryoblast in week 2?
Definition
if forms bilaminar disc
Term
What are the two layers of the bilaminar disc?
Definition
1.epiblast
2.hypoblast
Term
What happens to the bilaminar disc(epiblast, hypoblast) in week 3?
Definition
they form a trilaminar disc by a primitive streak(notocord)
Term
What are the 3 layers of the trilaminar disc?
Definition
1.ectoderm-was eepiblast
2.mesoderm-from primitive streak
3.endoderm-was hypoblast
Term
What are the two ends of the trilaminar disc? What do they form?
Definition
1.cephallic end(opopharyengeal membrane)- forms throat
2.caudal end (colical membrane)- forms anus
Term
Where does the neural plate form? What are the cells made from this?
Definition
top of mesoderm, neuroectoderm
Term
What does the neural plate form?
Definition
the neural groove which then forms the neural tube
Term
What develop in the neural tube?
Definition
38 somites
Term
What happens in week 4?
Definition
the trilaminar disc folds, endoderm on the inside, with cephallic and caudal ends, face and neck begin to develop
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