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.
1 Meyer-Weigert Rule - clinical term for the arrangement of the ureter in a completely duplicated renal system, the ureter from the upper renal pole enters the bladder more medially and caudally than the ureter from the lower renal pole.  renal agenesis - term for a complete absence of renal development.