Contains axonal endings of neurons originating in the hypothalamus. Contains axons of hypothalamic neurons which terminate in pars nervosa. B. Anterior pituitary . Derived from oral ectoderm . Develops from Rathke's pouch, an outgrowth of the roof of the mouth.
Pars distalis .
Secretes six different hormones. Variety of cell types can be identified by light microscopy using selective staining techniques. Secrete growth hormone or prolactin . Secrete TSH , ACTH , FSH , and LH . May be inactive or undifferentiated cells.