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Tecniche diagnostiche per lo studio dell’apparato nefro-urinario

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Riassunto

I reni sono situati nello spazio retroperitoneale ai lati del muscolo psoas, all’altezza del tratto D11-L3 della colonna vertebrale, a circa 7 cm di profondità dal piano posteriore. Hanno forma “a fagiolo”, con il lato concavo rivolto medialmente e anteriormente; presentano un asse maggiore approssimativamente di 12 cm, e formano un angolo di circa 20 gradi aperto verso il basso, sul piano frontale. L’ilo, attraverso il quale passano vasi, nervi, linfatici e bacinetto, si trova al centro del lato concavo. Il parenchima renale presenta due distinte zone: la corticale, periferica, che contiene i glomeruli e i tubuli contorti prossimali e distali e, con le colonne del Bertin, si approfonda nella midollare fino all’ilo; la midollare, interna, che contiene le restanti parti del sistema tubulare, rappresentata dalle piramidi, le cui basi sono rivolte verso la corticale, mentre gli apici guardano verso l’ilo formando le papille renali che aggettano nei calici. Ogni rene è costituito dai lobi renali, unità funzionali anatomicamente distinte ma fuse tra loro; in ogni rene sono presenti da 5 a 14 lobi, ciascuno dei quali è formato da una massa centrale conica di sostanza midollare (piramide) circondata, eccetto che a livello della papilla, da uno strato di tessuto corticale (Fig. 22.1).

Anatomia macroscopica del rene

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Chiacchio, S., Bruselli, L., Biggi, E., Fommei, E., Volterrani, D. (2010). Tecniche diagnostiche per lo studio dell’apparato nefro-urinario. In: Volterrani, D., Mariani, G., Erba, P.A. (eds) Fondamenti di medicina nucleare. Springer, Milano. https://doi.org/10.1007/978-88-470-1685-9_22

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