Bilaminar Germ Flashcards

1
Q

Capacitation

A

sperm “condition” uterine tube as cap is exposed.

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2
Q

Acrosome reaction

A

sperm’s rectors exposed as glycoprotein cap is removed and then can bind to Zona Pellucida

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3
Q

Cortical Rxn

A

after sperm and oocyte membranes have fused, enzymes from lysosome released from granules around oocyte so only 1 sperm penetrates

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4
Q

zona rxn

A

hardening of zona pellucida so no more sperm can penetrate

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5
Q

Blastomere to blastocyst?

A

when zygote divides it becomes blastomere until 4 days when loses its potency and zona pellucida and becomes blastocyst at 32

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6
Q

inner vs. outer cells of 8-celled blastomere

A

inner: become embryo, yolk sac, and amnion
outer: form trophoblast

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7
Q

When/how does implantation occur

A

Day 16. Lining of uterus thickened by Progesterone secreted by Corpus Luteum allowing for trophoblasts to invade

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8
Q

Inner Layer of Trophoblast

A

cytotrophoblast, mononucleated

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9
Q

Outer layer of trophoblast

A

synchtotrophoblast:
releases Chorionic Gonadotrophin which is detected for pregnancy and keeps corpus luteum continuing
forms lacunae of blood in mom’s endometrium

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10
Q

amnioblast cells

A

come from inner blastomere cells. make up amnion

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11
Q

epiblast

A

top embryonic layer formed from inner blastomere cells. will make all dermal layers

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12
Q

hypoblast

A

lower embryonic layer formed from inner blastomere cells

contributes to 2nd yolk sac

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13
Q

blastocyst

A

below hypoblast will become yolk sac

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14
Q

different sack layers from inner to outer

A
amniotic sac
2nd. yolk sack
chorionic cavity/Chorionic extraembryonic plate
-->inner: somatopleuric
-->outer: splanchnopleuric
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