neurohaemal organ
Pronunciation: /ˌnjʊroʊˈhiːməl/
A specialized structure where neurosecretory axons terminate near blood vessels to release hormones directly into circulation.
Full Definition
A neurohaemal organ is a specialized anatomical structure that serves as an interface between the nervous and endocrine systems, where neurosecretory axon terminals come into close contact with blood vessels or sinusoids. These organs allow for the direct release of neurohormones from nerve terminals into the bloodstream, bypassing traditional synaptic transmission. Examples include the posterior pituitary (neurohypophysis) and the median eminence. The structural arrangement facilitates rapid hormone release and systemic distribution, making these organs critical components of neuroendocrine regulation.
Usage
Usage note: Alternative spelling 'neurohemal' is also acceptable; ensure consistent usage within documents.
In Context
- "The posterior pituitary functions as a neurohaemal organ, releasing ADH and oxytocin into systemic circulation." — Anatomy textbook
- "Damage to the neurohaemal organ resulted in impaired hormone release despite intact neurosecretory cell function." — Research findings