Releasing of sperms from seminiferous tubules is called

$A$ : Corticotrophin releasing hormone is a part of the clock that establishes the timing of birth.
$R$ : The signals for parturition originate from the fully developed foetus and placenta which induce mild uterine contractions called foetal ejection reflex.

Hormone injected by doctors to induce delivery is

The eggs in which fate of every part of the egg becomes fixed are called

Drugs such as Thalidomide taken by woman in first trimester of pregnancy cause all the following malformations in the developing embryo, except