Question Bank [2022] — BIOLOGY STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYQuestion Bank [2022]2 Marks
Question
Describe the structure of Graafian follicle.
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Answer
Structure of Graafian follicle:
The Graafian follicle is a mature ovarian follicle.
The secondary oocyte is located eccentrically (away from the centre) and is surrounded by a non-cellular layer of zona pellucida secreted by the vitelline membrane of the oocyte,
There are three layers covering the Graafian follicle. They are as follows:
The outermost protective and fibrous covering is called theca externa.
Inner to it is cellular theca interna which produces the hormone estrogen.
Inner to the theca interna, the follicular cells from the membrane granulosa.
From the membrane granulosa, the cells differentiate into discus proligerus and the corona radiata cells.
Oocyte and the surrounding granulosa cells are together termed as Cumulus oophorus.
A fluid-filled cavity called antrum lies between the oocyte and the membrane granulosa. It is filled with a fluid called liquor folliculi.
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