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The antrum is...

The antrum is

A

Fluid filled cavity of Graffian follicle

B

An inner theca interna

C

The secondary follicle

D

Fluid filled cavity of primary follicle

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "The antrum is:", we need to analyze the options provided in the context of ovarian follicle development. Here’s a step-by-step breakdown: ### Step 1: Understand the Definition of Antrum The antrum is a specific structure within the ovarian follicles. It is a fluid-filled cavity that develops during the maturation of the follicle. ### Step 2: Identify the Types of Follicles - **Primary Follicle**: This is the initial stage of follicle development where the primary oocyte is surrounded by a layer of granulosa cells. At this stage, there is no antrum present. - **Secondary Follicle**: This stage has more layers of granulosa cells, but still does not contain an antrum. - **Tertiary Follicle (or Graafian Follicle)**: This is the stage where the antrum forms. It is characterized by the presence of a large fluid-filled cavity, which is the antrum. ### Step 3: Analyze the Options - **A. Fluid filled cavity of Graafian follicle**: This is correct because the antrum is indeed a fluid-filled cavity found in the Graafian follicle. - **B. An inner theca interna**: This is incorrect; the antrum is not a part of the theca layers. - **C. The secondary follicle**: This is incorrect as the secondary follicle does not have an antrum. - **D. Fluid filled cavity of primary follicle**: This is also incorrect because primary follicles do not have an antrum. ### Step 4: Conclusion The correct answer is **A. Fluid filled cavity of Graafian follicle**. The antrum is formed during the transition from the tertiary follicle to the mature Graafian follicle.
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