Sertoli cells are regulated by the pituitary hormone known as

The amnion of mammalian embryo is derived from

Sperm enters from which part of egg?

$A$ : Oxytocin acts on the uterine muscles and cause stronger uterine contractions, which in turn stimulates further secretion of oxytocin.
$R$ : Oxytocin is released from maternal pituitary

Trophoblast, is not involved in the formation of