Here's why:

* Neurohypophysis: This term refers to the posterior lobe of the pituitary gland. It's derived from the Greek words "neuron" (nerve) and "hypophysis" (growth).

* Posterior Pituitary: This is the more common name for the neurohypophysis. It's a small, bean-shaped gland located at the base of the brain.

While the posterior pituitary gland is part of the pituitary gland, it's actually an extension of the hypothalamus, a region in the brain that controls many vital functions. The neurohypophysis stores and releases hormones produced by the hypothalamus, including:

* Antidiuretic hormone (ADH): Regulates water balance and blood pressure.

* Oxytocin: Plays a role in childbirth, breastfeeding, and social bonding.

So, although the posterior pituitary gland is part of the pituitary, its unique connection to the hypothalamus earns it the name "neurohypophysis."