University:
Texas A&M University
Course:
BIOL 111 | Introductory Biology I
Academic year:

2019
Views:

238

Pages:

34
Author:

behend6abs

Pituitary (Masson’s trichrome) Infundibular stalk Pars tuberlaris Carcinoma Pars nervosa Pars intermedia Pars distalis 3 divisions of the pituitary gland: 1. Pars distalis 2. Pars intermedia 3. Pars nervosa Pars intermedia Pars distalis Pars intermedia Pars nervosa Pars distalis Pars distalis Pars intermedia Pars 79nervosa Releasing hormones are distributed in second capillary bed of venous portal system Into the first capillary network Second capillary network Pituitary gland, sheep pituicytes pars intermedia pars distalis pars nervosa basophils acidophils Pituitary gland, various species. basophils acidophils pars nervosa pars distalis. pars intermedia chromophobes a large colloid-filled cleft (remnant of Rathke’s pouch) Pituitary gland, various species. pars intermedia, pars nervosa pars distalis chromophobes acidophils, basophils, Pituitary gland, various species. pars intermedia, pars distalis pars nervosa Pituicytes of pars nervosa acidophils, capillary basophils, Pituitary gland, various species. pars intermedia, pars distalis Pars tuberlaris pars nervosa Pituitary gland, various species. pars distalis pars nervosa pars distalis pars intermedia, pars nervosa Pituitary gland, various species. bovine pars intermedia, pars nervosa pars distalis Pituitary Gland, sheep acidophils (red/orange), basophils (dark pink/purple), and chromophobes (nuclei surrounded by clear cytoplasm) pars distalis pars intermedia, pars nervosa Pituitary Gland, sheep many veins and nerves acidophils pars nervosa pars imtermedia pars distalis pituicytes Infundibular stalk pars distalis pars distalis Herring bodies in pars nervosa of Hypophysis Pars nervosa Thyroid, monkey. colloid represents the storage form of thyroid hormones. thyroglobulin numerous thyroid follicles simple cuboidal epithelium termed parafollicular “follicular cells” or “C” cells, produce the hormone calcitonin COLLAGENOUS CONNECTIVE TISSUE (CCT) UNILOCULAR ADIPOSE TISSUE (WHITE FAT) Slide #80 (Pfi-122a). Thyroid, monkey. thyroid follicles calcitonin causes a DECREASE in blood calcium concentrations and the principle counter balance to calcitonin in its regulation of blood calcium levels is PARATHYROID HORMONE Thyroid gland, cow. thymus thyroid follicles simple cuboidal epithelium “follicular cells” Thyroid gland and lymph node, pig. UNILOCULAR ADIPOSE TISSUE (WHITE FAT) lymph node COLLAGENOUS CONNECTIVE TISSUE (CCT) Thyroid gland thyroid follicles Thyroid and parathyroid glands, dog. vascularity of this organ numerous colloid-filled follicles of the thyroid gland principal or chief cells (oxyphil cells) parathyroid glands Parathyroid – chief cells and oxyphils Parathyroid – chief cells and oxyphils Osteoporosis due to hyperparathyroidism Adrenal gland, horse. zona glomerulosa outer cortex zona fasciculata zona reticularis inner medulla Blood vessels medulla has chromaffin cells ZONA GLOMERULOSA ZONA FASCICULATA ZONA RETICULARIS Adrenal gland, dog. Note: A special stain was used on this slide. Chromaffin cells the chromaffin reaction. The enteroendocrine cells within the gastrointestinal tract will show the same chromaffin reaction if processed with dichromate. zona glomerulosa zona fasciculata zona reticularis Pancreas, dog. Rich vasculature pancreatic islets PANCREAS HAS CENTROACINAR CELLS But no STRIATED DUCTS Pancreas, cat. SMALL INTESINE pancreatic islets Rat pancreas Islet cells Pancreas, dog Immunocytochemistry of Islet cells stained for glucagon Pancreas, dog Bata cells producing insulin Immunocytochemistry of Islet cells stained for insulin Pancreas, dog Immunocytochemistry of Islet cells stained for somatostatin Modified from the McGraw-Hill Companies Capillary bed por·tal1 Extra parts of ˈpôrdl/ a portal system Portal vessel noun 1. a doorway, gate, or other entrance, especially a large and elaborate one. synonyms: doorway, gateway, entrance, exit, opening (1 st CAPILLARY in hypothalamus) PORTAL VEIN In stalk 490 Human pituitary 2 nd CAPILLARY Pars distalis Pars distalis VENOUS PORTAL SYSTEM Region A Region B Modified from the McGraw-Hill Companies local change in releasing hormones blood composition (first capillary network in “region A” modifies the blood by adding releasing hormones) and second capillary network in “region B” (uses hormone rich blood from the portal vessel to alter function of the cells in the pars distalis to produce their specific hormones[ LH, TSH, ACTH]) ISLETS Of LANGERHANS First capillary network of the ARTERIAL PORTAL SYSTEM modifies blood composition with insulin / glucagon First capillary network Second capillary network Second capillary network uses the modified blood composition with insulin (+) / glucagon (-) to regulate acinar cell protein enzyme production

Pituitary Gland

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