Ciclul spermatogenetic Flashcards

1
Q

precursorii celulari

A

endoblastii cu origine in peretii sacului vitelin
migrati in sapt 3-5 in creasta gonadala

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2
Q

in creasta gonadala

A

celulele =GERMINALE PRIMORDIALE (gonocite emrionare)

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3
Q

prin proliferare, gonocitele embrionare devin

A

spermatogonii

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4
Q

protoplasma spermatogoniilor

A

nucleu mare , rotund cu reticul cromatic si nucleol
aparat golgi si mitocondrii sit in jurul idiosomei

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5
Q

idiosoma

A

protoplasma omogena
contine in int centrozomii

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6
Q

fazele ciclului spermatogenetic

A

2
spermatogeneza
spermiogeneza

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7
Q

spermatogeneza

A

trans spermatogonii in spermatocite 1 si 2 apoi in spermatide

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8
Q

spermiogeneza

A

prin citodiferentiere, transf spermatide in spermatozoizi
fara diviziuni celulare

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9
Q

spermatogeneza are loc in

A

tubii seminiferi contorti
in 60 de zile

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10
Q

tubi seminiferi pana la pubertate

A

aspect de cordoane pline dat proliferarii gl sexuale embrionare

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11
Q

in peretii se deosebesc 2 tipuri de celule

A

celule sursa germinale mai putine
celule indiferente mai multe

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12
Q

la pubertate, cordoanele seminale

A

capata lumen, devin tubi seminiferi
nr crescut de celule sexuale
nr mic de celule de sustinere = celule SERTOLI

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13
Q

celulele SERTOLI

A

prov din transformarea celulelor ndiferente
rol in nutritie
functii hormonale
functie de spermatie

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14
Q

functia de spermatie

A

= convertirea spermatidei in spermie

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15
Q

spermatogonii A

A

celule de rezerva din care rezulta spermatogoniile B

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16
Q

spermatogonii B

A

div mitotice ale A
cresc
nu se divid
formeaza spermatocitele primare

17
Q

spermatocitul primar

A

diploid
profaza de 21 zile
div meiotica primara reductionala
rezulta 2 spermatociti secundari haploizi

18
Q

spermatocit secundar

A

haploid
meioza secundara egala
rezulta spermatida

19
Q

din spermatogeneza rezulta

A

2 spermatociti secundari
4 spermatide

19
Q

din spermatogeneza rezulta

A

2 spermatociti secundari
4 spermatide

20
Q

spermiogeneza

A

prin citodferentiere

21
Q

spermatida

A

rotunda
imobila
se va converti in spermatozoid

22
Q

cum se converteste spermatida in spermie?

A

nucleu devne condensat si alungit configurand capul spermiei
complex Golg - acrozomul spermiei
mitocondriile - teaca spiralata la baza flagelului cu rol energetic in cinetica flagelara
centriol - flagelul spermiei