HYPOTHALAMUS

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-It is present at the floor of fore brain.
-Hypothalamus contain groups of neurosecretory cells which secrete neurohormones.-These hormone controls the secretion and synthesis of pituitary hormones.
-Two types of hormone are secreted by hypothalamus.

1.Releasing hormone            2. Inhibitory hormone


1.Releasing hormone:-These hormone stimulates the pituitary to secrete other hormone.These are as follows-
*Gonadotrophin releasing hormone(GnRH)-Stimulate pituitary to release gonadotrophin.
-Gonadotrophin are of two types-

(a)Follicle stimulating hormone(FSH-RH)
(B)Luteinising hormone releasing hormone(LH-RH) in female while ICSH-RH in male.
*Thyrotrophin releasine  hormone (TRH)- It stimalates anterior pituitary to  release Adrenocortioco trophic hormone (ACTH).
*Growth hormone releasing hormone (GH-RH ) or Somatotrophin releasing hormone.. 
-It stimulates pituitary to produce growth hormone (GH).
*Prolactin releasing hormone( PRH)or Luteotrophic or lactogenic hormone releasing hormone (LTH-RH).
-It slimalates petuitary to produce prolactin hormone..
2.Inhebitory hormone- These hormones of hypothalamues inhibetes the production of hormones in the pituitary.
*Growth hormone inhibiting hormone (GHIH) or somatotrophin inhibiting hormone (SIH)
-It checks the release of GH 
* Prolactin inhibiting hormone (PIH)-It check the secretion of prolactin. 
Neurohormone directly poured  in pituitary
Two hormone as oxytocin and vasopressin directly poured in the posterior pituitary gland.
                                                

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Facts about Coma

Coma is a prolonged period of unconsciousness. Unconsciousness is the lack of appreciation of (or reaction to) a stimulus. Coma differs from sleep in that one cannot be aroused from a coma.

Coma involves two different concepts:

1.) Reactivity: Reactivity refers to the innate (or inborn) functions of the brain, i.e., the telereceptors (eyes and ears), the nociceptors (responses to pain), the arousal reaction (wakefulness) and the orienting response (turning one's head toward the source of sound or movement). We could also refer to these as reflexive movements.

2.) Perceptivity: Perceptivity refers to the responses of the nervous system to stimuli, which have been learned or acquired, i.e., language, communication skills, individual methods of movement such as gestures, etc. Perceptivity also refers to less complex learned or acquired reactions such as flinching when threatened. We can also think of these as conscious movements.

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