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8 Cards in this Set
- Front
- Back
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What are the (3) parts of the andenohypophysis and what are the (2) parts of the neurohypophysis?
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Adeno:
1. Pars Distalis 2. Pars tuberalis 3. Pars intermedia Neuro: 1. Pars nervosa 2. Infundibulum (median eminence and stem) |
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How did the pituitary glad develop?
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The posterior portion developed as a down-growth of the neural tube and the anterior portion grew from the roof of the mouth. The anterior portion pinches off and can form "Rathke's pouches"
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What hormoes are made/released by the post pituitary? How are they released?
Where is each hormone made, specifically?? |
Oxytocin and ADH are made by hypothalamic neurons. They then travel down the hypothalamic-hypophyseal tract and are stored in Herring bodies in the terminal axons. Oxytocin and ADH are released when the neurons fire.
Paraventricular nucleus = oxytocin Supraoptic nucleus = ADH |
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The 2 major cell types in the adenohypophysis are the chromophobes and the chromophiles. What hormones are made by the two types of chromophiles? For each hormone, what is it's hypothalmic releasing and inhibiting hormone?
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Acidophils: Prolactin (+ GRH, - Somatostatin)
GH (+ PRH, - PIH) Basophils: FSH & LH (+ GnRH) Thyrotropin = TSH (+TRH) Corticotropin = ACTH (+CRH) |
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How does the hypothalamus communicate with the ant pituitary?
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1. When stimulated, hypothalmic neurons secrete +/- hormores into the primary capillary plexus.
2. Hormones drain into the portal veins, where they + or - the release of hormones from the ant. pituitary. 3. If stimulated, the hormones are released into the secondary plexus. FSH, LH, GH, Prolactin, ACTH & TSH! |
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In the thyroid, how does the epithelial and follicle shape change with activity?
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The taller the epithelium and the smaller the follicle, the more active the gland.
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How is the thyroid colloid produced and how is it consumed?
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Thyroglobulin is made by the epithelial cells and secreted into the follicles. Iodide is removed from the blood and oxidized, then released into the colloid where it binds with thyroglobulin. The follicular cells then phago the colloid, vesicles fuse with lysosomes and T3 and T4 are realeased into the cytoplasm then into the capillaries of the surrounding CT.
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Where does calcitonin come from?
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The parafollicular cells!
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