What is the functional relationship between the hypothalamus and the posterior pituitary?
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The hypothalamus is a region of the brain that controls an immense number of bodily functions. It is located in the middle of the base of the brain, and encapsulates the ventral portion of the third ventricle.
Careful examination of the pituitary gland reveals that it composed of two distinctive parts:
The image to the right shows a frontal view of a pig pituitary gland and hypothalamus. The posterior gland can be seen peeking out behind the anterior gland; pass your mouse cursor over the image for labels (image courtesy of Dr. G. P. Kozlowski). The anterior and posterior pituitary have separate embryological origins. In many mammals, there is also an intermediate lobe (pars intermedia) between the anterior and posterior pituitary. A key to understanding the endocrine relationship between hypothalamus and anterior pituitary is to appreciate the vascular connections between these organs. As will be emphasized in later sections, secretion of hormones from the anterior pituitary is under strict control by hypothalamic hormones. These hypothalamic hormones reach the anterior pituitary through the following route:
This pattern of vascular connections is presented diagramatically below. Note also the hypothalamic-hypophyseal portal vessels in the image of a real pituitary gland seen above. The utility of this unconventional vascular system is that minute quantities of hypothalamic hormones are carried in a concentrated form directly to their target cells in the anterior pituitary, and are not diluted out in the systemic circulation. Advanced and Supplemental Topics
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What is the relationship between the hypothalamus and pituitary glands How do the anterior and posterior segments differ?The hypothalamus region lies inferior and anterior to the thalamus. It connects to the pituitary gland by the stalk-like infundibulum. The pituitary gland consists of an anterior and posterior lobe, with each lobe secreting different hormones in response to signals from the hypothalamus.
What is the functional relationship between the hypothalamus and the anterior pituitary quizlet?-The hypothalamus controls the anterior pituitary gland with special hormones called releasing hormones and inhibiting hormones.
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