Identify A, B and C from the given diagram of Graafian follicle and mention their significance :[Figure: a mature Graafian follicle with a large fluid-filled antrum. A points to the outermost layer of the follicle, B to the layer just inside it, and…

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Q.16 Identify A, B and C from the given diagram of Graafian follicle and mention their significance : [Figure: a mature Graafian follicle with a large fluid-filled antrum. A points to the outermost layer of the follicle, B to the layer just inside it, and C to the centre of the oocyte lying in a mound of granulosa cells (cumulus) projecting into the antrum.]

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Answer: LabelPartSignificance ATheca externaOuter fibrous connective tissue layer of the follicle; gives support and protection to the follicle. BTheca internaInner vascular, glandular layer; its cells secrete the female sex hormone oestrogen (and supply nourishment to the follicle). CSecondary oocyte (ovum) with its nucleusFemale gamete; it is released at ovulation and, after fertilisation, forms the zygote. It is surrounded by the zona pellucida and corona radiata and is held on the cumulus oophorus (discus proligerus). (The thick layer of follicular cells lining the antrum is the membrana granulosa, which also secretes oestrogen and the follicular fluid; after ovulation the follicle changes into the corpus luteum.)

Identify A, B and C from the given diagram of Graafian follicle and mention their significance :[Figure: a mature Graafian follicle with a large fluid-filled antrum. A points to the outermost layer of the follicle, B to the layer just inside it, and…

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Label	Part	Significance
A	Theca externa	Outer fibrous connective tissue layer of the follicle; gives support and protection to the follicle.
B	Theca interna	Inner vascular, glandular layer; its cells secrete the female sex hormone oestrogen (and supply nourishment to the follicle).
C	Secondary oocyte (ovum) with its nucleus	Female gamete; it is released at ovulation and, after fertilisation, forms the zygote. It is surrounded by the zona pellucida and corona radiata and is held on the cumulus oophorus (discus proligerus).