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Chapter 3
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28
Anatomy
Undergraduate 1
08/20/2011

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Term
embryology
Definition
the study of the origin and development of the individual person
Term
prenatal period
Definition
between conception and birth
Term
embryonic period
Definition
the fist 8 weeks
Term
fetal period
Definition
last 30 weeks
Term
embryo
Definition
early form of the body. by the end, all major organs are in place
Term
fetus
Definition
in the fetal period the organs grow more complex
Term
oocyte
Definition
immature egg
Term
conception
Definition
fertilization of oocyte by sperm
Term
zygote
Definition
fertilized occyte
Term
blastomers
Definition
the cells produced through division after fertilization.
Term
cleavage
Definition
division of cells
Term
morula
Definition
first 12-16 blastomeres at day three...it continues to grow
Term
blastocyst
Definition
post morula. the form has developed into more than 60 cells and has dropped into the uterus. it gathers fluid in a central cavity.
Term
inner cell mass vs trophoblast
Definition
2 types of cells in the blastocyst . 1=mas on one side of the cell-becomes embryo 2=surrounds the cavity-becomes placenta
Term
implantation
Definition
the blastocyst burrows into the wall of the uterus
Term
bilaminar embryonic disc
Definition
gives rise to the whole body. made up of the epiblast and the hypoblast
Term
amnion
Definition
the sac formed by the extension of the epiblast
Term
yolk sac
Definition
formed by the extension of the hypoblast - digestive tubes for from part of it.
Term
primitive streak
Definition
on the dorsal surface of the epiblast on day 14-15
Term
gastrulation
Definition
epiblast cells migrate inward through the primitive streak
Term
endoderm
Definition
the cells that migrate through the primitive streak and replace the hypoblast day 14-15
Term
mesoderm
Definition
the layer of epiblast cells that go through the primitive streak and layer on top of the endoderm day 16
Term
ectoderm
Definition
the remaining epiblast celss on the dorsal surface after the endoderm and mesoderm have fromed
Term
primitive node
Definition
swelling at one end of the primitive streak
Term
neurulation
Definition
the ectoderm, overlying the notochord, begins forming the spinal cord and brain
Term
neural plate
Definition
thicking portion of the ectoderm in the dorsal midline
Term
neural groove
Definition
the grove formed when the neural plate folds inward
Term
neural tube
Definition
forms out of the deepening of the neural groove
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