Fetus of four months intrauterine life shows the following features except
**Core Concept**
The development of a four-month-old fetus involves significant morphological changes, and understanding these changes is crucial for identifying normal and abnormal fetal development. The fetus at this stage is undergoing rapid growth and differentiation, with the formation of major organs and body systems.
**Why the Correct Answer is Right**
At four months of gestation, the fetus's limbs are relatively well-developed, with fingers and toes distinct from each other. The head is more rounded, and the facial features are becoming more defined. The lungs are beginning to produce surfactant, and the pancreas starts producing digestive enzymes. The fetal skin is thin and translucent, allowing for the visibility of underlying blood vessels.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it is not a feature of a four-month-old fetus.
**Option B:** This option is incorrect as it is not a characteristic of a four-month-old fetus.
**Option C:** This option is incorrect as it is not a feature of a four-month-old fetus.
**Clinical Pearl / High-Yield Fact**
A key milestone in fetal development at four months is the formation of the thymus, which starts producing T-lymphocytes, essential for the fetal immune system. This period is critical for the development of the central nervous system, with significant growth and differentiation of neurons.
**Correct Answer:** D.