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.
, distension (dis-ten'shÅ­n), Although distension is historically the more correct spelling, the word is usually spelled distention in the U.S. The act or state of being distended or stretched. See also: dilation. [L. dis-tendo, to stretch apart] n a state of dilation. the state of being distended, or stretched out or enlarged; the act of distending. For individual local distentions see the location, e.g. abomasal distention.