What is a Subfornical organ?
What is a Subfornical organ?
The subfornical organ (SFO) is a circumventricular organ recognized for its ability to sense and integrate hydromineral and hormonal circulating fluid balance signals, information which is transmitted to central autonomic nuclei to which SFO neurons project.
Are OVLT and SFO in the hypothalamus?
The OVLT and SFO lie, respectively, at the ventral and dorsal boundaries of the third ventricle (seeFig. 7.5). Because it lies at the rostral and ventral tip of the third ventricle, the OVLT is surrounded by cell groups of the preoptic region of the hypothalamus.
What is the AV3V region?
Abstract. The AV3V region is important in the control of body fluid and Na+ regulation and projects to the supraoptic and paraventricular nuclei. Oxytocin from the neurohypophysis mediates milk ejection and is involved in parturition, but has also been recently implicated as a candidate natriuretic hormone.
What does Circumventricular mean?
Circumventricular organs (CVOs) (circum-: around ; ventricular: of ventricle) are structures in the brain characterized by their extensive and highly permeable capillaries, unlike those in the rest of the brain where there exists a blood–brain barrier (BBB) at the capillary level.
What is the supraoptic nucleus?
The supraoptic nucleus is a collection of magnocellular neurosecretory cells (MNCs) located within the anterior hypothalamus that participate in the HPA axis. The primary function of these cells is to produce and secrete the peptide hormone vasopressin, also known as antidiuretic hormone (ADH) and oxytocin.
What are Circumventricular organs?
The circumventricular organs (CVOs) are highly vascularized structures located around the third and fourth ventricles and characterized by the lack of a blood–brain barrier (BBB). These specialized areas are points of communication between the blood, the brain parenchyma, and the CSF.
What is Ovlt?
Organum vasculosum laminae terminalis (OVLT) is a brain site to produce interleukin-1 beta during fever. Brain Res.
Where are Osmoreceptors located?
the hypothalamus
Osmoreceptors (Fig. 4-11) located in the hypothalamus (and also in the carotid artery) are capable of sensing the concentrations of solutes, particularly sodium ion. This leads to a secretion of vasopressin.
Where is the median preoptic nucleus?
The median preoptic nucleus (MnPO) is a dense cluster of small cells in the lamina terminalis that extends along the anterior border of the third ventricle from the tip of the preoptic recess of the third ventricle dorsocaudally to a small triangular area between the descending columns of the fornix (Atlas plates 18–20 …
What are Circumventricular organs in the brain?
Which of the following is a Circumventricular organs?
The seven circumventricular organs (shown as poppy-colored ovals) are the area postrema (AP), median eminence (ME), neurohypophysis (N), organum vasculosum of the lamina terminalis (OVLT), pineal (P), subcommissural organ (SCO), and subfornical organ (SFO).
