To add a little more detail to Pat's summary........

Prolactin is made in the anterior pituitary and is a primary lactation
hormone, though one of three in the Lactogenic Complex of prolactin,
cortisol and insulin.

Oxytocin, which is known for milk ejection but which actually also
influences prolactin receptor regulation, is produced by the hypothalamus
and released through the posterior pituitary.

 Thyroid function is rather complicated: Thyroid-releasing hormone (TRH)
from the hypothalamus stimulates Thyroid Stimulating Hormone (TSH)  in the
pituitary, which then stimulates the thyroid to produce T3 and T4.  

~Lisa Marasco, who's been delving deeper lately


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