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Question

Antrum is found in:

A
secondary follicle
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B
none of these
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C
tertiary follicle
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D
primary follicle
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Solution

The correct option is C tertiary follicle

Antrum is a fluid filled cavity found in the tertiary follicle.

Follicles are formed inside the ovary. The various follicles formed inside the ovary include: primary follicle, secondary follicle, tertiary follicle and Graafian follicle (mature follicle).

Primary follicle consists of a primary oocyte enclosed by a layer of granulosa cells.

The primary follicle transforms into a secondary follicle which is surrounded by many layers of granulosa cells and a new theca layer.

The secondary follicle transforms into tertiary follicle in which a cavity develops called antrum. The theca gets differentiated into an outer theca externa and an inner theca interna. Inside the tertiary follicle, the primary oocyte completes meiosis I and forms into the secondary oocyte.

The tertiary follicle transforms into a mature Graafian follicle that gets ruptured to release the secondary oocyte.


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