Foetal Physiology: Correct Statement Analysis

This section examines the physiological milestones in foetal development to determine the correct statement among the given options.

Analyzing Foetal Development Milestones

1. Haematopoiesis Timing

Statement: Haematopoiesis is demonstrated first in the yolk sac by 14th day.

Explanation: This statement is accurate. The process of blood cell formation, known as haematopoiesis, originates in the embryonic yolk sac during the early stages of development, typically around the third week (approximately day 14-17).

2. Meconium Formation

Statement: Meconium appears at 16 weeks.

Explanation: While the formation of meconium (the first stool) begins around the 16th week of gestation, its appearance or passage is generally associated with the later stages of pregnancy or occurs after birth.

3. Foetal Breathing Movements

Statement: Breathing movements are identified at 26 weeks.

Explanation: Foetal breathing movements are detectable earlier than 26 weeks. They often commence around 20-24 weeks gestation and become more consistent later in the pregnancy.

4. Foetal Insulin Secretion

Statement: Foetal pancreas secretes insulin as early as 20 weeks.

Explanation: The secretion of insulin by the foetal pancreas starts much earlier, around 10-12 weeks gestation. Significant increases in secretion occur later, but the onset is well before 20 weeks.

Conclusion on Foetal Physiology

Comparing the timelines, the statement regarding the initial demonstration of haematopoiesis in the yolk sac by the 14th day is the most accurate representation of early foetal physiological development.

Correct Statement Identified

The correct statement regarding foetal physiology is: Haematopoiesis is demonstrated first in the yolk sac by 14th day.