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Embryology
Embryology section of Human Anatomy
62
Anatomy
Undergraduate 2
06/29/2011

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Cards

Term
another word for fertilization
Definition
conception
Term
endometrium
Definition
inner lining of uterus
Term
name of the embryo in the uterus
Definition
Blastocyst
Term
function of placenta
Definition
exchange of nutrients and waste products Oz/C02 between mother and baby
Term
chorionic villi
Definition
finger-like projections, part of the zygote
Term
Chorion frondosum
Definition
portion of the chorion that develops the chorionic villi
Term
placenta is formed from which 2 parts
Definition
chorion frondosum and decidua basalis
Term
Decidua Basalis of endometrium
Definition
contain mothers blood vessels
Term
two main events of 2nd week of development
Definition
development of chorionic villi and differentiation of the inner cell mass into 3 types of germinal tissues
Term
3 types of germinal tissues
Definition
ectoderm, mesoderm, and endoderm
Term
neural tube
Definition
development of CNS0 brain and spinal cord
Term
three main events in 3rd week of development
Definition
development of neural tube
differentiation of 3 germinal tissues
secretion of CG hormone by chorionic villi into maternal circulation
Term
Ectoderm differentiates into what?
Definition
epidermis and central nervous system
Term
Mesoderm develops into what?
Definition
paraxial mesoderm, intermediate mesoderm, and lateral plate mesoderm
Term
Chorionic Gonadotropin hormone (CG)
Definition
secreted by the chorionic villi into the maternal circulation
stimulates the mother's ovaries to secrete progesterone and estrogen throughout pregnancy
Term
what week is CG detectable int he blood stream?
Definition
3rd week
Term
Progesterone does what for pregnancy?
Definition
stimulates vascularization- blood vessels grow to nourish baby
Term
most critical period of human embryonic development
Definition
4th to 8th week- if anything goes wrong baby is born w/ serious deformities
Term
5 events of 4th week of development
Definition

development of flat embryonic disk into a tubular-shaped embryo -constriction between gut and yolk sac -segmentation of the paraxial mesoderm into somite

-development of brain into 3 regions: forebrain, midbrain, and hindbrain

-development of heart beat

 

 

Term
week when the paraxial mesoderm segments into 43 pairs of somites
Definition
4th week
Term
week that the brain develops into 3 regions: forebrain, midbrain, and hindbrain
Definition
4th week
Term
week of development of a beating heart
Definition
4th week
Term
purpose of umbilical cord
Definition
blood vessels of UC carry nutrients through the placenta from mother to baby
Term
spinal cord develops from which germinal tissue?
Definition
Ectoderm
Term
Parietal peritoneum develops from which subtype of which germinal tissue?
Definition
somatic mesoderm of the lateral plate mesoderm
Term
Dermis of skin
Definition
Term
Tropoblast layer of blastocyst
Definition
develops into the chorion
Term
inner cell mass of the blastocyst
Definition
develops into the embryo
Term
when does the blastocyst implant into the endometrial lining of the uterus?
Definition
by the end of the 1st week
Term
pre-embryonic phase
Definition
1st-3rd weeks of pregnancy
Term
The alimentary canal develops from which germinal tissue?
Definition
endoderm
Term
when does the central nervous system begin to develop?
Definition
3rd week of development
Term
which week does the flat embryonic disk develop into a tubular shaped embryo?
Definition
4th week
Term
The Axial skeleton develops from the subtype of which germinal tissue?
Definition
Paraxial mesoderm then the axial skeleton
Term
The skeletal muscles develop from which subtype of which germinal tissue?
Definition
myotome of the paraxial mesoderm
Term
the urogenital system develops from which germinal tissue?
Definition
intermediate mesoderm
Term
The visceral peritoneum develops from which subtype of which germinal tissue?
Definition
splanchnic mesoderm of the lateral plate mesoderm
Term
what important event occurs at the 5th week of development?
Definition
further differentiation of the mesodermal tissues (paraxial, intermediate, and lateral plate mesoderm)
Term
The lateral plate mesoderm differentiates into what during the 5th week of development?
Definition
somatic mesoderm and splanchnic mesoderm
Term
The paraxial mesoderm differentiates into what in the 5th week of development?
Definition
the dermatome, myotome, and sclerotome
Term
What subtype of which germinal tissue does the dermis of the skin develop from?
Definition
dermatome of the paraxial mesoderm
Term
Which 3 things develop from the endoderm in the 5th week of development?
Definition
digestive system, respiratory system, and the endocrine glands
Term
somite
Definition
segment of vertebra
Term
2 main causes for birth defects
Definition
genetics
exposure to a teratogenic agent
Term
what is the most important even that occurs during the 8th week?
Definition
bones begin to calcify
Term
which week does digits on hands and feet develop
Definition
8th week
Term
when can sex of child be determined?
Definition
3rd month (12th week)
Term
what event occurs at the 4th month?
Definition
mandible has developed so fetus exhibits a chin
Term
when are eyelids formed and closed?
Definition
3rd month
Term
when do nails begin to develop
Definition
3rd month
Term
when can the mother begin to feel fetal movements?
Definition
the 5th month
Term
Vernix Caseosa
Definition
greasy, cheasy- begins to cover skin at the 4th month/16th week
Term
what month are the eyebrows and eyelashes present?
Definition
6th month
Term
what month does the pulmonary alveoli begin to develop?
Definition
the 6th month
Term
when is the fetus capable of surviving pregnancy?
Definition
28th week
Term
what month does the fetus normally rotate into the cephalic presentation?
Definition
7th month/28th week
Term
which week is their very active movements by the fetus?
Definition
the 8th week
Term
when do the testes begin to descend down into the scrotum
Definition
9th month
Term
full-term pregnancy
Definition
9 1/2 lunar months/ 38 weeks
Term
what 3 things happen at the 10th month?
Definition
-testes are fully descended, the nails project beyond the digits, and the lanugo hair disappears
Term
fetal phase
Definition
9th week to birth
Term
week head makes up half of the embryo
Definition
8th week
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