The ureters

Urine formed by the nephrons leaves each kidney by a single ureter at a point known as the hilus lΓig. 10.4). Each ureter is a narrow muscular tube running cau­dally towards the bladder, one on each side of the mid­line in Ihedorsal abdomen (Eigs. 10.2 and 103). Each ureter is suspended from the dorsal Ixxly wall by a fold of visceral peritoneum, the ιnesoureteι:

Urine is pushed along the tube towards the bladder by peristaltic waves brought about by contraction of the Sni(M)Ih muscle Iibres forming the ureter walls. Truusitionul epithelium lines the ureters and allows for expansion as urine passes along.