**Core Concept**
Lines of Blaschko’s are embryological patterns that reflect the developmental pathways of skin during fetal growth, specifically tracing the migration and proliferation of skin cells in the developing embryo.

**Why the Correct Answer is Right**
These lines represent developmental pathways of the skin, formed during early embryogenesis when the skin grows in a specific, predictable manner. They are not related to lymphatic, nervous, or vascular systems, but rather to the embryonic folding and growth of the dermal layers. The patterns arise from the migration of skin cells from the primitive ectoderm and are visible in skin lesions, such as linear nevi or erythema, which follow these developmental lines.

**Why Each Wrong Option is Incorrect**
Option A: Lymphatics – Lines of Blaschko do not follow lymphatic pathways; lymphatics are separate and do not form these embryological lines.
Option B: Nervs – Nerve pathways are not aligned with Blaschko’s lines; nerves grow independently and do not form these patterns.
Option D: Blood vessels – Blood vessels do not follow these lines; vascular patterns are independent and not correlated with developmental embryology.

**Clinical Pearl / High-Yield Fact**
Blaschko’s lines are critical in dermatology to understand the distribution of congenital skin lesions—such as linear nevi or epidermal inclusion cysts—because they appear in linear, branching patterns that reflect embryonic development. This makes them a key tool in diagnosing and classifying skin disorders.

✓ Correct Answer: C. Developmental