GENERAL KNOWLEDGE

Detailed explanation-1: -The ampulla is the middle part of the oviduct where fertilization and early cleavage of the fertilized ovum occur. The highly muscular isthmus transports the fertilized ovum (embryo) from the site of fertilization into the uterine lumen.

Detailed explanation-2: -The proximal part is called the infundibulum, which is flared and ‘fringed’ (fimbriated). This leads into a longer, thin walled ampulla, which has primary, secondary and tertiary longitudinal mucosal folds. This leads into a short thicker-walled isthmus, which has fewer longitudinal mucosal folds.

Detailed explanation-3: -During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst.