1. UTERINE OR INTERSTITIAL PART is the most medial part which passes through the thick uterine wall. 2. ISTHMUS is the narrow and thick walled part, which is just next to the uterine part. It is about 2.5 cm in length. 3. AMPULLA is the next thin walled and dilated part of the uterine tube. It is the largest part (7 cm) of the uterine tube. 4. INFUNDIBULUM refers to the funnel shaped lateral end of the tube. It is prolonged into a number of finger like processes known as fimbria and is attached to the outer pole of the ovary.