Download - SISTEMA NERVOSO - Unife
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SISTEMA NERVOSO
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SVILUPPO DELL’ENCEFALO
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VENTRICOLI CEREBRALI
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Ponti citoplasmatici intracellulari
Fase mito1ca: dura 20 gg, avviene per proliferazione e differenziamento degli spermatogoni. Dividendosi danno luogo a popolazione sia di cellule staminali che di cellule des1nate alla meiosi
Spermiogenesi: cambiamen1 morfologici:1. Formazione dell’acrosoma2. Modificazione del nucleo e della
forma della cellula3. Formazione del flagello4. Eliminazione citoplasma in eccesso e
degli organelli citoplasma1ci5. Condensazione della croma1na6. Rilascio degli spermatozoi
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STRUTTURA DELLOSPERMATOZOO
L’acrosoma derivadall’apparato del Golgi econtiene enzimi che aiutano lospermatozoo ad entrareattraverso la corona radiata enella zona pellucida dell’uovo.
La coda contiene i microtubulidel sistema propulsivo deglispermatozoi.
Il segmento intermediocontiene grandi mitocondridisposti a spirale che generanol’energia per far nuotare glispermatozoi.
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Il ciclo ovarico è indotto dagli ormoni gonadotropi(FSH e LH). Gli ormoniovarici (estrogeni e progesterone) promuovono invece cambiamenti ciclici nella struttura e nella funzione dell’endometrio (cicli uterini)
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Segmentazione
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