HMB200H1 Lecture Notes - Lecture 11: Anterior Pituitary, Posterior Pituitary, Circumventricular Organs

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16 Apr 2014
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Lecture 12: hypothalamus and homeostasis. Input: receives hormonal inputs from the circumventricular organs. Hormonal feedback to the brain used to stop the production of hormones. This means that many large hormones cannot get into the brain. Blood brain barrier helps protect the brain from poisons and helps the brain from getting confused by circulating molecules. However, there are leaky capillaries 6 tiny nuclei near ventricles where the ink goes in circumventricular organs. Lateral hypothalamus directs most of the motivational behaviors: output: Thyroid stimulating hormone (tsh) released from anterior pituitary, which targets the thyroid for the releasing of thyroid hormones (thyroxine) Hormones to brain: blood- brain barrier (glia surrounding brain capillaries) prevents entry of large molecules in most brain regions. Set of cells that surround the vessels going into the brain. Prevents large hormones and molecules from entering the brain = prevents brain form being poisoned. Prevents brain from being confused between its own transmitters and circulating molecules.

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