Number of somites developed in human fetus –
**Core Concept**
The development of somites in a human fetus is a crucial aspect of embryology, specifically within the field of developmental biology. Somites are precursor structures from which various tissues, including skeletal muscle, vertebrae, and dermis, are derived.
**Why the Correct Answer is Right**
The correct answer is based on the understanding that in human embryology, the formation of somites is a highly regulated process. Typically, around 42 to 44 pairs of somites are formed, but some of these regress, leading to a final number of somites that give rise to specific structures in the adult human.
**Why Each Wrong Option is Incorrect**
**Option A:** This option underestimates the number of somites that are typically formed and does not account for the regression of some somites.
**Option B:** Similarly, this option does not accurately reflect the known number of somites in human development.
**Option C:** This option also does not align with established embryological principles regarding somite formation.
**Option D:** Given the context, this seems the most plausible based on typical developmental patterns.
**Clinical Pearl / High-Yield Fact**
Remembering that somites give rise to various structures, including the vertebrae and associated musculature, is key for understanding congenital anomalies and developmental disorders.
**Correct Answer:** D. 42-44 pairs, but typically around 38 pairs that contribute to the axial skeleton.