paraventricular nucleus
Hypothalamic region that produces oxytocin, vasopressin, and corticotropin-releasing hormone.
Full Definition
The paraventricular nucleus (PVN) is a critical neuroendocrine center located in the hypothalamus that synthesizes and releases several important hormones and neuropeptides. It contains magnocellular neurons that produce oxytocin and vasopressin for release from the posterior pituitary, as well as parvocellular neurons that secrete corticotropin-releasing hormone (CRH) and other releasing factors that control anterior pituitary function. The PVN plays essential roles in stress response, water balance, parturition, lactation, and circadian rhythms, making it a key structure in neuroendocrine regulation.
Usage
Usage note: Can be abbreviated as PVN after first mention; always lowercase 'nucleus' unless beginning a sentence.
In Context
- "Lesions in the paraventricular nucleus resulted in disrupted circadian cortisol secretion." — Research study
- "The paraventricular nucleus showed increased activation during acute stress testing." — Neuroimaging report