The Hypothalamus and Pituitary Glands

The Hypothalamus and Pituitary Glands - The Hypothalamus...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
The Hypothalamus and Pituitary Glands The hypothalamus makes up the lower  region of the diencephalon and lies just  above the brain stem. The pituitary  gland (hypophysis) is attached to the  bottom of the hypothalamus by a  slender stalk called the infundibulum.  The pituitary gland consists of two  major regions: the anterior pituitary  gland (anterior lobe or  adenohypophysis) and the posterior  pituitary gland (posterior lobe or  neurohypophysis).
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The hypothalamus oversees many  internal body conditions. It receives  nervous stimuli from receptors  throughout the body and monitors  chemical and physical characteristics of  the blood, including temperature; blood  pressure; and nutrient, hormone, and  water content. When deviations from  homeostasis occur or when certain  developmental changes are required,  the hypothalamus stimulates cellular  activity in various parts of the body by  directing the release of hormones from  the anterior and posterior pituitary  glands. The hypothalamus  communicates directives with these 
Background image of page 2
glands by one of the following two  pathways: Communication between the  hypothalamus and the anterior  pituitary occurs through  chemicals (releasing hormones  and inhibiting hormones) that are  produced by the hypothalamus  and delivered to the anterior  pituitary through blood vessels in  the infundibulum. The releasing  and inhibiting hormones are  produced by specialized neurons  of the hypothalamus, called  neurosecretory cells. The 
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
hormones are released into a  capillary network (primary  plexus) and transported through  veins (hypophyseal portal veins)  to a second capillary network  (secondary plexus) that supplies  the anterior pituitary. The primary  plexus and the hypophyseal  portal veins are in the  infundibulum and the secondary  plexus is in the anterior pituitary.  The hormones then diffuse from  the secondary plexus into the  cells of the anterior pituitary,  where they initiate the production  of specific hormones by the 
Background image of page 4
anterior pituitary. The releasing 
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

Page1 / 14

The Hypothalamus and Pituitary Glands - The Hypothalamus...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online