Muscle tone. Definition. noun. (1) The muscle in a steady partially contracted state caused by the successive flow of nerve impulses. (2) The amount of tension or resistance to movement in a muscle. Supplement. Muscle tone or tonus helps in maintaining body posture.
Hydronephrosis is the distention of the pelvis and calyces of one or both kidneys, resulting in thinning of the renal tubules because of obstructed urinary flow. When the obstruction is a stone or kink in one of the ureters, only one kidney is damaged.
A âureteral stentâ or âureteric stentâ is a thin, hollow tube inserted into the ureter. Ureters are thin tube-like-organs which connect kidneys to the urinary bladder, to allow urine flow from the kidney. The stent is longer than the actual ureter and tube-ends are usually coiled.