Final answer:
The axons from the hypothalamus that release hormones into the Pars nervosa are associated with the posterior pituitary gland, which stores and releases hormones produced by the hypothalamus, such as ADH and oxytocin.
Step-by-step explanation:
The axons from the hypothalamus that release hormones into the capillaries of the Pars nervosa are associated with the posterior pituitary gland.
a) Posterior Pituitary - Axons from the hypothalamus release hormones into the capillaries of the Pars nervosa associated with this gland.
The posterior pituitary, or neurohypophysis, is an extension of the neuronal tissue of the hypothalamus. The hypothalamus is functionally and anatomically connected to the posterior pituitary through nerve axons. These axons form the hypothalamic-hypophyseal tract which travels down the infundibulum, ending in the posterior pituitary. Here, hormones such as antidiuretic hormone (ADH), also known as vasopressin, and oxytocin, which are produced in the hypothalamus, are stored in the axon terminals. Unlike the anterior pituitary, the posterior pituitary does not produce its own hormones; it stores and secretes hormones produced by the hypothalamus. When neural signals from the hypothalamus are received, these hormones are released from the axon terminals into the bloodstream. It is important to note that while the hormones are released into the circulatory system at the posterior pituitary, they are produced by neurons in the hypothalamus.