Which among the following hormones helps in skeletal maturation of the fetus?

AIIMS Raipur - 2017 (Shift-3)

Obstetrics & Gynecology

Easy

Appeared in: AIIMS Raipur - 2017 (Shift-3)

Explanation

Thyroxin, a hormone produced by the thyroid gland, is essential for the normal development of the fetal skeletal system.
It plays a critical role in the process of ossification (bone formation) and promotes linear bone growth.
A deficiency of maternal and/or fetal thyroid hormones can lead to delayed skeletal maturation and a condition called congenital hypothyroidism (cretinism), which involves stunted growth and intellectual disability.

Option A: Testosterone is a male sex hormone primarily responsible for the development of male reproductive organs and secondary sexual characteristics, not overall skeletal maturation.
Option B: Oxytocin's main roles are stimulating uterine contractions during labor and milk ejection (let-down reflex) during breastfeeding. It has no direct role in fetal bone development.
Option D: Prolactin is primarily involved in preparing the maternal mammary glands for lactation and stimulating milk production after childbirth.

Visual 1: Diagram - A flowchart showing the influence of maternal and fetal thyroxin on fetal bone and brain development. This helps visualize the pathway and importance of the hormone.
Visual 2: Illustration - A comparison of a fetus with normal skeletal development versus one with stunted growth due to thyroid hormone deficiency. This provides a clear visual contrast of the effects.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Role of hormones in fetal development, specifically skeletal maturation as background academic context rather than a clinical decision trigger.
Nurses play a key role in screening pregnant women for thyroid dysfunction. Routine monitoring of thyroid-stimulating hormone (TSH) levels is crucial, especially in high-risk pregnancies.
Patient education is vital. Nurses must educate expectant mothers about the importance of adequate iodine intake (for thyroid hormone synthesis) and adherence to prescribed thyroid medication for the health of their baby.
What if? If a pregnant woman is diagnosed with hypothyroidism in the first trimester, the primary intervention is immediate levothyroxine replacement therapy. The nurse's role includes educating the patient on the critical need for this therapy to prevent adverse fetal outcomes like cretinism.

How to Approach the Question

First, identify the core concept of the question: a hormone's role in 'fetal skeletal maturation'.
Next, analyze the function of each hormone listed in the options, specifically in the context of pregnancy and fetal development.
Recall or deduce the primary role of each hormone: Testosterone (male sex characteristics), Oxytocin (labor/lactation), Thyroxin (growth/metabolism), Prolactin (milk production).
Compare these functions to the question's requirement. Thyroxin is the only hormone directly linked to systemic growth and development, including the skeleton.
Eliminate the other options because their primary functions are highly specific and not related to bone development.

Concept Tested & Keywords

Concept Tested: Role of hormones in fetal development, specifically skeletal maturation.
Stem keywords: hormones, skeletal maturation, fetus
Lead-in keywords: Which among
Negative lead-in flag: false

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