324Lecture21 endocrine

324Lecture21 endocrine - Endocrine Glands Part Zwei Adrenal...

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Endocrine Glands Part Zwei
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Adrenal (Suprarenal) Glands Adrenal Glands: complex functions and origins. Paired organs attached to cranial pole of kidney; hilum present; divided into cortex and medulla. Cortex derived from mesodermal epithelium Medulla from neural crest and presumptive autonomic ganglia. Organ parts exist as separate organs in lower vertebrates; chromaffin body and supra-renals.
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Adrenals Capsule of DICT with trabeculae of in cortex, reticular CT throughout parenchyma. Cortex: a) Zona glomerulosa - outer zone (~15%) b) Zona fasciculata - middle zone (~65%) c) Zona reticularis - inner zone (~7%) Collectively the cortical zones secrete 40 steroid products.
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Zona fasciculata Steroid Secreting Cells Abundant SER No Secretory Granules
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Zona Glomerulosa - large oval groups of simple columnar epithelium with no lumen; Basophilic. - Secretions = mineralocorticoids
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324Lecture21 endocrine - Endocrine Glands Part Zwei Adrenal...

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