ANS 3310 - Ch. 10 - Spermatogenesis

Proliferation Phase

all mitotic divisions of spermatogonia; results in primary spermatocytes during spermatogenesis leading to meiosis

as maturation occurs, cells move from ___________ toward __________. 

basement membrane; lumen

Spermatogenesis takes place entirely in?

seminiferous tubules

True or False: testosterone concentrations in the testes are 100-500x higher than in the blood

true

LH acts on what type of cells?

Leydig Cells

What is the purpose of inhibin?

paces the secretion of FSH through negative feedback

what cells secrete inhibin?

sertoli cells

FSH has _____ the half life of LH

3x

What is the frequency of endocrine episodes?

4-8 episodes/24 hrs

what center is NOT present in the male?

surge

endocrine requirements for spermatogenesis

adequate secretion of GnRH, FSH and LH secretion, secretion of gonadal steroids

acrosomal phase

spermatid elongates; acrosome covers most of anterior nucleus

distal centriole

gives rise to axoneme (flagellum)

proximal centriole

implantation apparatus that allows flagellum to anchor to nucleus

4 phases of differentiation

golgi, cap, acrosomal, maturation

sertoli cells are analogous to?

granulosal cells

sertoli cells are ______ dependent

FSH

in what species do testes secrete estradiol?

boars and stallions

LH must be _______ for normal testicular function

pulsatile

leydig cells are analogous to?

theca interna cells

maturation phase

mitochondria migrate and form a spiral

cap phase

acrosomic vesicle spreads over nucleus

golgi phase

acrosomic vesicle formation

differentiation phase

formation of acrosome

meiotic phase

beings with primary spermatocytes; results in haploid spermatids