ANAT 1010 Chapter Notes - Chapter 22: Sympathetic Ganglion, Hyoid Bone, Basal Metabolic Rate

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15 Mar 2017
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Hormones: powerful effects even if in low concentrations, most of the body"s hormones affect only a few types of cells - some cells respond to a particular hormone and others do not. Infundibulum: pars intermedia - third region that atrophies during fetal development and ceases to exist as a separate lobe in adults. From the primary plexus, blood drains into the hypophyseal portal veins that pass down the surface of the infundibulum. In the anterior pituitary, the hypophyseal portal veins divide again and form another capillary network called the secondary plexus of the hypophyseal portal system: neurosecretory cells, clusters of specialized neurons. Somatotrophs secrete human growth hormone (hgh) which stimulates general body growth and regulates aspects of metabolism. Stimulate several tissues to secrete insulin-like growth factors (igfs) hormones that stimulate general body growth and regulate various aspects of metabolism. From this plexus, hormones pass into the posterior hypophyseal veins for distribution to target cells in other tissues.

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