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324Lecture20 endocrine - Endocrine Glands Endocrine Glands...

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Endocrine Glands
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Endocrine Glands Complex embryological organs: a) ectodermal - amino acid analogues; including catecholamines. b) mesodermal - steroid secretions. c) endodermal - protein (peptide secretions).
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Hypophysis (Pituitary) Referred to as the "Master Gland" - said to control all endocrine glands-actually controlled by the hypothalamus Complex embryological origin - oral ectoderm and neural ectoderm. Oral ectoderm migrates cranially from roof of the oral cavity forming the Adenohypophysis = anterior pituitary (Rathke's Pouch).
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Hypophysis (Pituitary) Neural ectoderm migrates caudally from the floor of the hypothalamus forming the neurohypophysis = posterior pituitary. - remains connected to floor of hypothalamus. Pituitary is encapsulated in a bony cavity of sphenoid bone = Sella Turcica.
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Hypophysis (Pituitary)
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Adenohypophysis A) Pars Distalis - largest part (~75%); inside a dense capsule (DICT); parenchyma of cuboidal epithelium in Reticular CT and capillary sinuses.
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