**Core Concept**
Merkel cells are specialized mechanoreceptors found in the epidermis of the skin, playing a crucial role in sensing touch and pressure. They are a type of mechanoreceptor that helps in the transmission of sensory information to the brain.

**Why the Correct Answer is Right**
Merkel cells are derived from the neural crest, a group of cells that arise from the ectoderm during embryonic development. These cells migrate to various parts of the body, including the skin, where they differentiate into Merkel cells. The neural crest is responsible for the development of various cell types, including neurons, glial cells, and melanocytes, in addition to Merkel cells. This process is crucial for the formation of the sensory receptors that enable us to perceive touch and pressure.

**Why Each Wrong Option is Incorrect**
**Option A:** Neural tube is not directly related to the development of Merkel cells. The neural tube gives rise to the central nervous system, including the brain and spinal cord.

**Option B:** Notochord is a precursor to the vertebral column and does not contribute to the development of Merkel cells.

**Option D:** Neural pore is not a recognized term in embryonic development and is not related to the origin of Merkel cells.

**Clinical Pearl / High-Yield Fact**
Merkel cells are one of the few mechanoreceptors found in the skin that are not innervated by sensory nerve fibers. Instead, they are directly connected to the nerve terminals of A-beta sensory neurons, allowing for rapid transmission of sensory information.

**✓ Correct Answer: C. Neural crest**