OVLTOrganum Vasculosum Laminae Terminalis
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And researchers had also worked out that when a person or animal is awake, neurons in another nearby structure known as the organum vasculosum lamina terminalis, or OVLT, sense the loss of water and signal the release of vasopressin, and induce thirst.
The researchers removed a thin slice from a rat's hypothalamus that contained the SCN, the supraoptic nucleus and the OVLT all together.