renal pelvis

      enlarged upper end of the ureter, the tube through which urine flows from the kidney to the urinary bladder. The pelvis, which is shaped somewhat like a funnel that is curved to one side, is almost completely enclosed in the deep indentation on the concave side of the kidney, the sinus. The large end of the pelvis has roughly cuplike extensions, called calyces, within the kidney—these are cavities in which urine collects before it flows on into the urinary bladder.

      Like the ureter, the renal pelvis is lined with a moist mucous-membrane layer that is only a few cells thick; the membrane is attached to a thicker coating of smooth muscle fibres, which, in turn, is surrounded by a layer of connective tissue. The mucous membrane of the pelvis is somewhat folded so that there is some room for tissue expansion when urine distends the pelvis. The muscle fibres are arranged in a longitudinal and a circular layer. Contractions of the muscle layers occur in periodic waves known as peristaltic movements. The peristaltic waves help to push urine from the pelvis into the ureter and bladder. The lining of the pelvis and of the ureter is impermeable to the normal substances found in urine; thus, the walls of these structures do not absorb fluids.

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Universalium. 2010.

Look at other dictionaries:

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  • Renal pelvis — The area at the center of the kidney. Urine collects here and is funneled into the ureter. * * * renal pelvis n a funnel shaped structure in each kidney that is formed at one end by the expanded upper portion of the ureter lying in the renal… …   Medical dictionary

  • renal pelvis — noun see pelvis (sense 2) …   English new terms dictionary

  • renal pelvis — noun a structure shaped like a funnel in the outlet of the kidney into which urine is discharged before passing into the ureter • Syn: ↑pelvis • Hypernyms: ↑cavity, ↑bodily cavity, ↑cavum • Part Holonyms: ↑kidney …   Useful english dictionary

  • renal pelvis — noun The funnel like dilated proximal part of the ureter in the kidney …   Wiktionary

  • renal pelvis — The area at the center of the kidney. Urine collects here and is funneled into the ureter, the tube that connects the kidney to the bladder …   English dictionary of cancer terms

  • stage 0 transitional cell carcinoma in situ of the renal pelvis and ureter — Abnormal cells are found in tissue lining the inside of the renal pelvis or ureter. These abnormal cells may become cancer and spread into nearby normal tissue. Stage 0 is divided into stages 0a (papillary carcinoma) and 0is (carcinoma in situ),… …   English dictionary of cancer terms

  • ampullary type of renal pelvis — a type of renal pelvis in which the calices open into a saclike central chamber …   Medical dictionary

  • branching type of renal pelvis — a type of renal pelvis without a central chamber, but simply formed by the merger of several calices at the opening into the ureter …   Medical dictionary

  • stage I transitional cell cancer of the renal pelvis and ureter — Cancer has spread through the lining of the renal pelvis and/or ureter, into the layer of connective tissue …   English dictionary of cancer terms

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