Dear harendraprasad,
I would like to explain you Neurohypophysis.
Neurohypophysis is a posterior part of pituitary gland.
Neurohypophysis is also know as  pars nervosa
It is a part of endocrine system.
The function of Neurohypophysis is storage and release of oxytocin and vassopressin.

I hope you understand this.

All the best