Hypothalamus

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hy·po·thal·a·mus

(hī'pō-thal'ă-mŭs), [TA]
The ventral and medial regions of the diencephalon forming the walls of approximately the ventral half of the third ventricle; it is delineated from the thalamus by the hypothalamic sulcus, lying medial to the internal capsule and subthalamus, continuous with the precommissural septum anteriorly and with the mesencephalic tegmentum and central gray substance posteriorly. Its ventral surface is marked by (from rostral to caudal) the optic chiasma, the unpaired infundibulum that extends by way of the infundibular stalk into the posterior lobe of the hypophysis, and the paired mammillary bodies. The hypothalamus consists of the anterior hypothalamic area [TA], dorsal hypothalamic area [TA], intermediate hypothalamic area [TA], lateral hypothalamic area [TA], and posterior hypothalamic area [TA], each of these containing specific nuclei. It has afferent fiber connections with the mesencephalon, limbic system, cerebellum, and efferent fiber connections with the same structures and with the posterior lobe of the hypophysis; its functional connection with the anterior lobe of the hypophysis is established by the hypothalamohypophysial portal system. The hypothalamus is prominently involved in the functions of the autonomic (visceral motor) nervous system and, through its vascular link with the anterior lobe of the hypophysis, in endocrine mechanisms; it also appears to play a role in neural mechanisms underlying moods and motivational states.
See also: pituitary gland.
[hypo- + thalamus]

hypothalamus

(hī′pō-thăl′ə-məs)
n.
The part of the brain that lies below the thalamus, forming the major portion of the ventral region of the diencephalon and functioning to regulate bodily temperature, certain metabolic processes, and other autonomic activities.

hy′po·tha·lam′ic (-thə-lăm′ĭk) adj.

hy·po·thal·a·mus

(hī'pō-thal'ă-mŭs) [TA]
The ventral and medial region of the diencephalon forming the walls of the ventral half of the third ventricle; delineated from the thalamus by the hypothalamic sulcus, lying medial to the internal capsule and subthalamus, continuous with the precommissural septum anteriorly and with the mesencephalic tegmentum and central gray substance posteriorly. Its ventral surface is marked by, from before backward, the optic chiasma, the unpaired infundibulum, which extends by way of the infundibular stalk into the posterior lobe of the hypophysis, and the paired mammillary bodies. The nerve cells of the hypothalamus are grouped into the supraoptic paraventricular, lateral preoptic, lateral hypothalamic, tuberal, anterior hypothalamic, ventromedial, dorsomedial, arcuate, posterior hypothalamic, and premammillary nuclei and into the mammillary body. It has afferent fiber connections with the mesencephalon, limbic system, cerebellum, and efferent fiber connections with the same structures and with the posterior lobe of the hypophysis; its functional connection with the anterior lobe of the hypophysis is established by the hypothalamohypophysial portal system. The hypothalamus is prominently involved in the functions of the autonomic nervous system and, through its vascular link with the anterior lobe of the hypophysis, in endocrine mechanisms; it also appears to play a role in neural mechanisms underlying moods and motivational states.
See also: hypophysis

hypothalamus

The region of the under-surface of the brain immediately above the pituitary gland. The hypothalamus is the area in which the nervous and hormonal systems of the body interact. It receives information relating to hormone levels, physical and mental stress, the emotions and the need for physical activity, and responds by prompting the pituitary appropriately. Nuclei in the lower region of the hypothalamus contain neurons that secrete growth hormone releasing hormone, gonadotropin releasing hormone, somatostatin and other regulating substances.

hypothalamus

the part of the sides and floor of the brain derived from the forebrain. Associated with the control of body temperature, it also partially controls the PITUITARY GLAND and contains centres controlling sleep and wakefulness, feeding, drinking, speech and osmoregulation, the last by secretion of ADH from neurosecretory cells. It is also associated with aspects of reproductive behaviour.

Hypothalamus

A structure within the brain responsible for a large number of normal functions throughout the body, including regulating sleep, temperature, eating, and sexual development. The hypothalamus also regulates the functions of the pituitary gland by directing the pituitary to stop or start production of its hormones.

hypothalamus

A group of nuclei at the base of the brain located in the floor of the third ventricle. It consists of the optic chiasma, the paired mammillary bodies, the tuber cinereum, the infundibulum and the pars posterior of the pituitary gland.

hy·po·thal·a·mus

(hī'pō-thal'ă-mŭs) [TA]
Ventral and medial regions of diencephalon forming walls of approximately the ventral half of third ventricle; delineated from the thalamus by the hypothalamic sulcus, lying medial to the internal capsule and subthalamus, continuous with the precommissural septum anteriorly and with the mesencephalic tegmentum and central gray substance posteriorly.
[hypo- + thalamus]
References in periodicals archive ?
I think that sexuality should still be subject to analysis, including the question of why we're gay instead of straight, which I think has nothing to do with the hypothalmus or interstitial brain cells, but has to do with trauma.
In exposed rats, he discovered that an excess of a crucial reproductive hormone, called luteinizing-hormone-releasing hormone (LHRH), was apparently trapped in the hypothalmus. Normally, in rats and humans, the hypothalamus produces LHRH, which is then channeled to the pituitary gland to trigger the next step leading to ovulation.
After the hypothalmus is surgically manipulated, management includes closely monitoring body water and electrolyte balance as well as a medication regimen.