Question

Antrum is cavity of

• A. Ovary
• B. Graafian follicle
• C. Blastula
• D. Gastrula

Answer 1

The correct option is B Graafian follicle

During the development of the foetus, many oogonia are produced which undergo mitosis and form primary oocytes which remain at prophase of meiosis I throughout the childhood. Primary oocytes are enclosed by a single layer of cells, the granulosa cells and form structures known as primordial follicles. Primordial follicle first becomes a primary follicle as the granulosa cells multiply and form many layers of cells around the primary oocyte. In addition, the cells from stroma of the ovary form further layers of granulosa cells and the theca and collectively known as secondary follicles. As the secondary follicle develops, a fluid is secreted by granulosa cells which contains the hormone oestrogen. A fluid -filled space or cavity, the antrum, develops in the follicle which is now called tertiary follicle. Oestrogen stimulates the growth of this follicle, which eventually becomes a mature follicle, the Graafian follicle.

Hence, Antrum is a cavity of Graafian follicle.

So, the correct answer is 'Graafian follicle'.