In medical nomenclature, ureter- specifies the ureter —a retroperitoneal, urothelium-lined structure with longitudinal/circular smooth muscle layers (extra longitudinal in distal third)—extending from renal pelvis over psoas muscle, crossing iliac vessels, to bladder trigone at ureterovesical junction. It prevents reflux via oblique entry and mucosal folds; obstructions cause hydronephrosis, while peristalsis originates from renal pacemakers.
ETYMOLOGY of Ureter-
latin From New Latin ureter, borrowed from Greek -oureter (οὐρητήρ), “ureter,” from ourein (οὐρεῖν, “to urinate”) + -agentive suffix -tēr; roots in Proto-Indo-European *ūr- (“to moisten, flow”). Entered anatomical use via Galen.