A función de relación (ii) sistema endocrino y aparato locomotor
Sistema endocrino ii
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Transcript of Sistema endocrino ii
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SISTEMA ENDOCRINO
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GLÁNDULAS
• HIPOFISIS• TIROIDES
• PARATIROIDES• SUPRARRENALES
• PINEAL
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GLANDULA TIROIDES
• Cartílagos (tiroides y cricoides)
• Glándula bilobulada– 3er lóbulo ascendente– Istmo
• Cápsula de TCDI
• FOLICULO TIROIDEO
• Hormonas:- T3 y T4- Calcitonina
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• Folículos 0.2 – 0.9 mm• Epitelio cúbico simple
(células foliculares)• Coloide tiroideo
– Tiroglobulina + T3 o T4
• Tabiques c/F. reticulares
• En tabiques (células C ó parafoliculares)
• Calcitonina
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Paratiroides• 4 glándulas
– IS, II, DS y DI• Región
posterior de la tiroides
• Hormona PTH
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• 5 X 4 mm• Cápsula de TCDI
c/tabiques• Fibras reticulares
• Células:• Principales• Oxifilicas
• Adipocitos aumentan con la edad hasta 60%
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• Células principales• 5-8 mm• Cit. Eosinófilo
– gránulos de lipofucsina
– Gránulos densos PTH
– Pre-PTH pro-PTH PTH
• Células Oxifílicas• 6-10 mm• Fuertemente
eosinofílicas• Células incativas
*
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Suprarrenal
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• Zona Glomerular
• 13% glándula• Cordones celulares cortos• Células cilíndricas• Abundante REL y
mitocondrias
• Síntesis de mineralocorticoides– Aldosterona– Desoxicorticosterona
– Equilibrio de líquidos y electrolitos
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• Zona Fasciculada
• 80% glándula• Columnas celulares
longitudinales• Células poliédricas
(espongiocitos)• Abundante REL RER Golgi y
mitocondrias con crestas tubulares
• Sintesis de glucocorticoides– Cortisol – Corticosterona
• Metabolismo de Carbohidratos grasas y proteínas
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• Zona Reticular• 7% glándula
• Cordones anastomosados
• Células poliédricas (espongiocitos) acidófilas– Células profundas c/núcleos
picnóticos
• Sintesis de andrógenos – dehidroepiandrosterona – androstenediona
• Andrógernos débiles
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• Médula
• Abundancia de tejido conectivo
• Doble riego sanguíneo
• Células:– Cromafines
• Adrenalina y noradrenalina
– Ganglionares simpáticas
*
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Pineal• Epifisis Techo del
diencefalo (tallo pineal)
• Cónica 5-8 X 3-5 mm
• Cápsula de piamadre
• Pinealocitosy Células intersticiales
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• Pinealocitos
• Irregulares basófilas, núcleos esféricos y listones sinápticos
• Melatonina secreción nocturna
• Serotonina secreción diurna
• Intersticiales
• Células gliales (astrocitos)
• Núcleo alargado citoplasma basófilo
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• Arenillas cerebrales
• Concreciones minerales– Carbonatos y
fosfatos de calcio
• Aumentan con la edad