Human Development Vocabulary

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Physical Science

12th

Last updated 2:58 PM on 1/17/23
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36 Terms

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pregnancy
events that occur from the time of fertilization until the infant is born
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gestation period
extends from last menstrual cycle period to birth
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embryonic period
occurs from fertilization through week 8
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embryo
called this during embryonic period
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fetal period
week 9 through birth
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fetus
called this during fetal period
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infant
called this at birth
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fertilization
sperms chromones combined with those of eggs
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zygote
fertilized egg/ first cell of new individual
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capacitation
biochemically delicate process enabling the sperm to be capable of penetrating the oocyte
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corona radiata
surround capsule of cells around oocyte
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zona pellucida
thick transparent membrane around oocyte
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cleavage
period of fairly rapid cell division of zygote without growth
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blastomere
first cleavage division of zygote
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morula
loose collection of cells of 16 or more
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blastocyst
hollow fluid filled sphere of cells
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implantation
blastocyst float in uterine cavity for 2-3 days
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pregnancy test
antibody test that detects hCG in blood/urine
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placenta
temporary pancake shaped organ that originates from embryonic & maternal issues
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chorion
outermost fetal membrane that helps to form the placenta
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endometrium
helps form placenta, layer expends to accommodate fetus & fills & stretch uterine cavity
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gastrula
contains primary germ layers & embryonic membranes
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amnion
forms a sac filled with fluid, surrounds embryonic
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yolk sac
main source of nutrients for embryo
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allantois
structural base for umbilical cord
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gastrulation
process in which 2 layered embryonic disc transforms into 3 layered embryo
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ectoderm
becomes skin and nervous system
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endoderm
forms lining of digestive, respiratory, & urogenital systems & associated glands
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mesoderm
middle layer & everything else
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organogenesis
formation of body organs and systems
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teratogens
factors that may cause severe congenital abnormalities or even death
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preclampsia
results deterioration of the placenta
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parturition
giving birth
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labor
series of events that expel infant from uterus
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engagement
when infants head enters true pelvis
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crowning
largest dimension of babies head descends the vulva