Term
are produced by the ovaries ( ) and expelled from them during ovulation.
The of the uterine tubes sweep the into the , where it may be fertilized.
Usually only one is expelled at ovulation.
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Definition
Oocytes
oogenesis
fimbriae
oocyte
ampulla
oocyte |
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Term
Sperms are produced in the ( ) and are stored in the .
Ejaculation of semen results in the deposit of millions of sperms in the vagina.
Several hundred sperms pass through the and enter the .
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Definition
testes
(spermatogenesis)
epididymis
uterus
uterine tubes |
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Term
When an is contacted by a sperm, it completes the division.
As a result, a mature and a are formed.
The nucleus of the mature constitutes the .
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Definition
oocyte
second meiotic
oocyte
second polar body
oocyte
pronucleus |
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Term
After the sperm enters the oocyte, the of the sperm separates from the tail and enlarges to become the .
is complete when the male and female pronuclei unite and the maternal and paternal chromosomes intermingle during of the division of the .
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Definition
head
male pronucleus
fertilization
metaphase
first mitotic
zygote
* pro-phase -> meta-phase -> ana-phase -> telo-phase.
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Term
As it passes along the uterine tube toward the uterus, the zygote undergoes cleavage (a series of cell divisions) into a number of smaller cells, or .
Approximately days after fertilization, a ball of 12 or more (a ) enters the uterus.
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Definition
mitotic
blastomeres
3
blastomeres
(morula) |
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Term
A forms in the morula, converting it into a consisting of the , a , and the .
The encloses the and and later forms extraembryonic structures and the embryonic part of the .
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Definition
cavity
blastocyst
embryoblast
blastocystic cavity
trophoblast
trophoblast
embryoblast
blastocystic cavity
placenta
[image] |
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Term
At 4 to 5 days after fertilizations, the is shed and the trophoblast adjacent to the attaches to the .
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Definition
zona pellucida
embryoblast
endometrial epithelium |
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Term
The trophoblast at the embryonic pole differentiates into two layers, an outer and an inner .
The invades the endometrial epithelium and underlying .
Concurrently, a cuboidal layer of forms on the deep surface of the embryoblast.
By the end of the first week, the is superficially implanted in the .
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Definition
syncytiotrophoblast
cytotrophoblast
syncytiotrophoblast
connective tissue
hypoblast
blastocyst
endometrium
[image]
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