| preoptic | Referring to the preoptic region. (05 Mar 2000) |
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| preoptic area | Region of hypothalamus between the anterior commissure and optic chiasm. (12 Dec 1998) |
| preoptic region | The most anterior part of the hypothalamus surrounding the anterior or preoptic part of the third ventricle and including the lamina terminalis; containing the lateral and medial preoptic nucleus continuous caudally with, respectively, the lateral and anterior hypothalamic nucleus; rostrally the preoptic region is continuous with the precommissural septum, laterally with the innominate substance. Synonym: preoptic area. (05 Mar 2000) |
| medial preoptic nucleus | A group of nerve cells forming the medial zone of the preoptic region. Synonym: nucleus preopticus medialis. (05 Mar 2000) |
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| lateral preoptic nucleus | A vaguely defined group of nerve cells in the lateral zone of the preoptic region. Synonym: nucleus preopticus lateralis. (05 Mar 2000) |