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Question

Granulosa layers being important layers that surround the follicle, when present around the follicles with a large central cavity, ruptures and releases secondary oocyte. This structure is called _________.

A
primary follicle
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B
Graafian follicle
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C
secondary follicle
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D
tertiary follicle
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Solution

The correct option is B Graafian follicle

During the process folliculogenesis (development of the follicle) takes place in the following sequence as given below.

Primordial follicle → Primary follicle → Secondary follicle → Tertiary follicle → Graafian follicle

Graafian follicle is the fully matured follicle that contains a large central follicular cavity (antrum) filled with a viscous liquid called liquor folliculi. Graafian follicle releases secondary oocytes from the ovary via a process called ovulation.

Each primary oocyte is surrounded by a layer of cells called granulosa cells thus it gets transformed into a primary follicle.

Primary follicles when they get surrounded by more layers of granulosa cells and new theca, they transform into secondary follicles.

Tertiary follicles are characterised by a fluid-filled cavity called the antrum having a well defined outer theca externa and inner theca interna.


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