Tubes, one lying each side of the pelvis and attached at one end to the UTERUS, with the other end unattached, but lying close to the OVARY. Each is 10–12.5 cm (4–5 inches) long, large at the end next to the ovary, but communicating with the uterus by an opening which admits only a bristle. These tubes conduct the ova (see OVUM) from the ovaries to the interior of the uterus. Blockage of the Fallopian tubes by a chronic inflammatory process resulting from infection such as CHLAMYDIA is one recognised cause of infertility in women. (See ECTOPIC PREGNANCY; REPRODUCTIVE SYSTEM.)