The endocrine gland below the brain is the pituitary gland. It is split into anterior (adenohypophysis) and posterior (neurohypophysis) sections. They differ in the hormones they produce.

Adenohypophysis: ACTH (adrenocorticotropic hormone), TSH (thyroid stimulating hormone), FSH (follicle stimulating hormone), LH (luteinizing hormone), GH (growth hormone), Prolactin

Neurohypophysis: Oxytocin, ADH (antidiuretic hormone, aka vasopressin)

The hypothalamus and the neurohypophysis are not the same. They are separate parts of the brin.

The adenohypophysis and neurohypophysis are located in the pituitary gland, which is in the center of the brain.

adenohypophysis anterior pitutary neurohypophysis posterior pitutary

Neurohypophysis