Question

Ostium is the aperture present in?
A. Oviduct
B. Fallopian funnel
C. Ovisac
D. Cloaca

Answer 1

In female reproductive parts, the proximal tubal opening that is, ostium is present in the uterus at the utero-tubal junction and can be accessed by hysteroscopy. And the other distal tubal opening that is, abdominal ostium opens in the infundibulum of the uterine tube in the abdominal cavity.

Complete answer:
Female reproductive system mainly consists of a pair of ovaries, fallopian tubes, uterus, vagina. Assessor glands and external genital organs. These all organs have different and important function for the production of female gametes, fertilization, provide proper environment for the fetus, regulation of female sex hormones, etc.
A funnel-shaped structure, called an infundibulum is present in the closer part of the ovaries. These infundibulum contain finger-like projections which are known as fimbriae. Fimbriae help in the collection of the female gametes after the ovulation.
The infundibulum leads to a wide part of the fallopian tube which is ampulla. The last part of the fallopian tube is isthmus which has a lumen which further connects to the uterus. The ostium of the oviduct or fallopian tube may be proximal or distal.
So, this is the structure of the fallopian tube or the oviducts.

Thus, we can conclude that ostium is present in the fallopian tube or oviduct of the female reproductive system and option ‘B’ is the correct answer.

Note: Accessory ducts of the female reproductive system consist of a pair of oviducts, uterus and vagina. Fallopian tube of the female reproductive system is about 10-12 cm in length and these tubes help in the association of the periphery of the ovary to the uterus.