The fallopian tubes are a pair of thin, soft soft tissue tubes in the female internal genitalia, located on either side of the base of the uterus. The tubes are connected to the right and left corners of the uterus on the inner side and extend outward in parallel, with their outer ends above the ovaries and open to the abdominal cavity, with a total length of about 8-14 cm. The interstitial part: located in the myometrium of the uterine horn, about 1 cm long, with a very thin lumen, about 1 mm in diameter, and the junction with the posterior isthmus is the thinnest part of the fallopian tube; 2, the isthmus: about 2-3 cm long, accounting for about 1/3 of the length of the entire fallopian tube, the entire isthmus is the thinnest part of the fallopian tube except for the junction with the interstitial part, with a diameter of less than 2 mm; 3, the abdomen of the jug: from the isthmus continues to extend outward, with a gradually enlarged and curved diameter. It is about 5-8 cm long, accounting for more than 1/2 of the length of the fallopian tube, with a diameter of about 1-2 mm at the junction with the isthmus, the more distal it is, with a longitudinal mucosa; 4, the funnel, also known as the umbrella: about 1-1.5 cm long, with a large longitudinal mucosal ridge, radiating and resembling a trumpet.