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Fallopian tube , also called oviduct or uterine tube , either of a pair of long, narrow ducts located in the human female abdominal cavity that transport male sperm cells to the egg , provide a suitable environment for fertilization , and transport the egg from the ovary , where it is produced, to the central channel lumen of the uterus. Each fallopian tube is 10—13 cm 4—5 inches long and 0. The channel of the tube is lined with a layer of mucous membrane that has many folds and papillae—small cone-shaped projections of tissue. Over the mucous membrane are three layers of muscle tissue; the innermost layer has spirally arranged fibres, the middle layer has circular fibres, and the outermost sheath has longitudinal fibres that end in many fingerlike branches fimbriae near the ovaries, forming a funnel-shaped depository called the infundibulum. The infundibulum catches and channels the released eggs; it is the wide distal outermost portion of each fallopian tube. Leading from the infundibulum is the long central portion of the fallopian tube called the ampulla. The isthmus is a small region, only about 2 cm 0. The final region of the fallopian tube, known as the intramural, or uterine, part, is located in the top portion fundus of the uterus; it is a narrow tube continuous with the isthmus, and it leads through the thick uterine wall to the uterine cavity, where fertilized eggs normally attach and develop. The channel of the intramural duct is the narrowest part of the fallopian tube.
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