arcuate nucleus


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Related to arcuate nucleus: Preoptic nucleus, paraventricular nucleus

ar·cu·ate nu·cle·us

[TA]
2. a cell group in the hypothalamus, located in the lowest part of the infundibulum adjacent to the median eminence. Synonym(s): nucleus arcuatus of medulla oblongata [TA]
3. a variable assembly of small cell groups, probably outlying components of the pontine nuclei, on the anterior and medial aspects of the pyramid in the medulla oblongata.
Synonym(s): nucleus arcuatus [TA]

arcuate nucleus

n.
Any of various specialized groups of nerve cells in the medulla oblongata, thalamus, or hypothalamus of the brain.

arcuate nucleus

A hypothalamic nucleus in the ventral wall of the third ventricle near the pituitary stalk. The arcuate nucleus produces inhibiting and releasing factors (adrenocorticotrophic hormone, beta-lipotrophic hormone, and beta-endorphin) for pituitary hormones.
Synonym: infundibular nucleus
See also: nucleus
References in periodicals archive ?
Elevated Kiss-1 expression in the arcuate nucleus prior to the cyclic preovulatory gonadotropin-releasing hormone/luteinising hormone surge in the ewe suggests a stimulatory role for kisspeptin in estrogen-positive feedback.
Kinney noted that the arcuate nucleus forms between 5 and 13 weeks' gestation and is typically completed by week 16.
Fasting induces a large, leptin-dependent increase in the intrinsic action potential frequency of orexigenic arcuate nucleus neuropeptide Y/Agouti-related protein neurons.
As the brain damage became chronic, the arcuate nucleus appeared to lose its sensitivity to hormonal cues about how much body fat exists, Schwartz says.