urinary system n.
The organs and passages of the urinary tract.
By a stage somewhat earlier than K important changes have taken place in the urinary system.
In the Amphibians the urinary system is again more primitive than in the Selachians.
At about the level of the fifth protovertebra the first trace of the urinary system appears.
The first traces of the urinary system become visible at about the time of the appearance of the third visceral cleft.
At the same stage the first not very distinct traces of the remainder of the urinary system become developed.
The first-formed duct and the subsequent involutions are the rudiments of the whole of the urinary system.
In Cyclostomous fishes the condition of the urinary system is very simple.
Scarcely an important organ of the body can suffer derangement without entailing a corresponding disorder of the urinary system.
The urinary system is frequently involved in the course of scurvy.
The system of organs and tissues involved with regulation of water content and salt concentration in the body and with the excretion of metabolic wastes and excess water and salt in the form of urine. In mammals, the urinary system consists of the urinary tract and associated tissues.