Which statement among the following is true as far as maturation of graafian follicle is concerned?

Chitranjjan National Cancer Institute Kolkata - 2021

Obstetrics & Gynaecology

Hard

Appeared in: Chitranjjan National Cancer Institute Kolkata - 2021

Explanation

The maturation of the Graafian follicle is dependent on the interplay of both Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH), a concept known as the 'Two-Cell, Two-Gonadotropin' model.
FSH is primarily responsible for the recruitment and growth of a cohort of ovarian follicles during the early follicular phase by acting on granulosa cells.
LH stimulates theca cells to produce androgens, which are then converted to estrogen by FSH-stimulated granulosa cells. A mid-cycle LH surge is the ultimate trigger for final follicular maturation and ovulation.
Therefore, maturation is not possible with only one of these hormones; their synergistic action is required.

Option B: While FSH is crucial for initiating follicular growth, it is not sufficient on its own. LH is required to provide the androgen precursors for estrogen synthesis and to trigger ovulation.
Option C: LH alone cannot stimulate follicular maturation from the early stages. The initial growth and development of the follicle cohort are driven by FSH.
Option D: Progesterone is the dominant hormone of the luteal phase (post-ovulation). Its primary function is to prepare the endometrium for implantation. It does not drive follicular maturation; high levels actually inhibit FSH and LH release.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Hormonal regulation of the ovarian cycle, specifically the maturation of the Graafian follicle as background academic context rather than a clinical decision trigger.
Understanding the roles of FSH and LH is fundamental in managing infertility. Ovulation induction protocols often use medications that mimic or are composed of FSH and LH.
For instance, in In-Vitro Fertilization (IVF), injections of FSH (gonadotropins) are given to stimulate the growth of multiple follicles. Then, an injection of hCG (which mimics the LH surge) is administered to trigger final maturation before egg retrieval.
Nurses play a key role in educating patients about these hormone injections, their timing, and potential side effects like Ovarian Hyperstimulation Syndrome (OHSS).

How to Approach the Question

First, identify the core concept of the question: the hormonal control of Graafian follicle maturation.
Recall the two main phases of the ovarian cycle: the follicular phase (follicle growth) and the luteal phase (corpus luteum activity).
Remember the key gonadotropins from the pituitary gland: FSH and LH.
Associate FSH with the 'Follicular' phase – it stimulates follicle growth. Associate LH with 'Luteinization' and the ovulatory surge.
Consider the 'Two-Cell, Two-Gonadotropin' model, which explains that both hormones work together: LH on theca cells and FSH on granulosa cells.
Evaluate each option based on this physiological model. Eliminate options that suggest a single hormone is solely responsible and the option involving a hormone from the wrong phase (progesterone).

Concept Tested & Keywords

Concept Tested: Hormonal regulation of the ovarian cycle, specifically the maturation of the Graafian follicle.
Stem keywords: maturation, graafian follicle
Lead-in keywords: true

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E6 Gynecology Williams p. 368-433

E6 Physiology Guyton 4SAE Part 3 p. 35-37