binds to kidney, ureters and bladder to abdominal wall •Perorenal fat (adipose) capsule–fatty middle layer–cushions kidney•Fibrous (renal) capsule–fibrous inner sac–encloses kidney like cellophane wrap
Renal Parenchyma•Renal parenchyma - glandular tissue that forms urine–2 Zones•Cortex – outer 1 cm•Medulla – pyramids•Renal sinus - cavity within the kidney–contains blood & lymphatic vessels, nerves, urine collecting ducts and fat•Renal columns– extensions of cortex that project toward the renal sinus–divide medulla into renal (medullary) pyramids
Renal Structures•Renal pyramids - 6 to 10 with broad base facing cortex and renal papilla facing sinus•Lobe- one pyramid and its overlying cortex•Minor calyx - cup that nestles the papilla of each pyramid and collects its urine•Major calyces - formed by convergence of two or three minor calyces•Renal pelvis - formed by convergence of two or three major calyces•Ureter - tubular continuation of the pelvis that drains the urine down to the urinary bladder
Renal AnatomyFibrous capsuleRenal cortexRenal medullaRenal pelvisMajor calyxMinor calyxUreterRenal papillaRenal sinusRenal columnRenal pyramidRenal bloodvessels
Fibrous capsuleRenal cortexRenal medullaRenal pelvisMajor calyxMinor calyxUreterRenal papillaRenal sinusRenal columnRenal pyramidAdipose tissuein renal sinusRenal bloodvesselsKidney Specimen
Lobe of Kidney•Broad side faces cortex•Papilla (pointy end) faces the renal sinus–Nestled in the minor calyx
Renal Circulation•Kidneys account for only 0.4% of body weight, but they receive about 21% of the cardiac output (renal fraction)•Renal artery divides into segmental arteriesthat give rise to:- interlobar arteries- up renal columns, between pyramids - Arcuate arteries- over pyramids- cortical radiate arteries- up into cortex-Branch into afferent arterioles: each supplying one nephron•Leads to a ball of capillaries – glomerulus
Renal Drainage•Blood is drained from the glomerulus by efferent arterioles-lead to peritubular capillaries -or vasa recta -cortical radiate veins -arcuate veins-interlobar veins•Renal veins empties into inferior vena cava
Blood Supply DiagramRenalmedullaRenalcortexCortical radiateartery and veinInterlobarartery and veinSegmentalarteryArcuatearteryand veinRenalarteryandveinGlomerulusAortaRenal a.Segmental a.Interlobar a.Arcuate a.Cortical radiate a.Afferent arterioleInferior vena cavaRenal v.Interlobar v.Arcuate v.Vasa rectaCortical radiate v.Efferent arteriolePeritubular capillaries
Renal Circulation•Cortex–peritubular capillaries branch off of the efferent arterioles –supply tissue near the glomerulus, the proximal and distal convoluted tubules•Medulla–efferent arterioles give rise to the vasa recta –supplying the nephron loop portion of the nephronMedullaCortexCortical radiateveinCortical radiatearteryEfferent arteriole
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- Spring '08
- Washo-Krupps
- Physiology, Anatomy, Human Anatomy, Nephron loop
