The hypothalamus serves the purpose of linking the nervous system and endocrine system via the pituitary gland. When acting on the posterior pituitary, the hypothalamus contains neurons that control the release of vasopressin (an antidiuretic hormone). Through the anterior pituitary, the hypothalamus has control over secretion of TSH and ACTH (protective hormones), stomach reflexes, blood pressure, maternal feeding, immunity, and temperature. The hypothalamus is most responsive to day length by sensing light (cicardian rhythms), smells or pheromones, steroids, and stimuli from the heart, stomach, and reproductive system.
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