QS Study

The ureters are a pair of narrow, thick-walled muscular tube which conveys urine from the kidneys to the urinary bladder. It is a tube that carries urine from the kidney to the urinary bladder.

Structure of ureter

The ureter is about 10 to 12 inches long in the average adult. The tube has thick walls composed of a fibrous, a muscular, and a mucous coat, which are able to contract.

It consists of three coats – fibrous, muscular and mucous. (From outside inward)

(A) Fibrous coat – It is mainly composed of elastic fiber and is continuous with the renal capsule.

(B) Muscular coat.

In the upper two-thirds of ureter it is arranged in two lavers – outer circular and inner longitudinal, in lower one third it consists of three layers outer longitudinal, middle circular and inner longitudinal.

(C) Mucous membrane – It is lined by transitional epithelium.

Fig: Structure of ureter

Development

The ureter develops from the ureteric diverticulum which grows cranially from the caudal part of mesonephoric duct before opening into the cloaca. The ureters have an expansive anastomosing network of arterial supply and venous drainage along their length.