Ovogeneza Flashcards

1
Q

ovogonii

A

celule germinale primordiale migrate din peretii sacului vitelin in creasta gonadala

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2
Q

ovogoniile sunt inconjurate de

A

foliculii corticali primari ai ovarului fetal
devin ovocite prmare

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3
Q

nr ovocite primare

A

fetal - cateva milioane
prenatal - sub 1000000
pubertate - 400000

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4
Q

ovocite primare

A

diploide raman in faza de profaza 1 pana la pubertate

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5
Q

ce secreta celulele foliculare

A

hormon inhibitor al maturatiei ovocitare

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6
Q

ce rezulta din div meiotica primara a ovocitului primar?

A

ovocit secundar - haploid cu intreaga cant de citoplasma
primul globul polar - fara citoplasma,cu garnitura cromozomiala haploida

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7
Q

in ce faza se afla ovulul ovulat?

A

inaintea diviziunii meiotice secundare

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8
Q

cand devine completa meioza 2?

A

numai in cazul fertilizarii, cand se obtine si un al doilea globul polar = polocitul 2

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9
Q

in ovogeneza, dintr un singur ovocit primar se dezvolta

A

un ovul matur si 2/3 globuli polari

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10
Q

fazele ciclului ovarian ovogenetica si foliculara

A

concomitent

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11
Q

foliculi primari si secundari

A

ovocite primare in profaza meiozei 1

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12
Q

folicul tertiar matur

A

ovocit secundar si primul globul polar

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13
Q

in ovulatie

A

ovul ovulat la inceputul meozei 2

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