**Core Concept**
Squamous cell carcinoma (SCC) is a type of skin or mucous membrane cancer characterized by the uncontrolled growth of squamous epithelial cells. The primary mode of spread for SCC is through lymphatic channels and direct invasion.

**Why the Correct Answer is Right**
SCC tends to spread via the lymphatic system due to the presence of lymphatic vessels in the skin and mucous membranes. The lymphatic system provides a route for cancer cells to metastasize to regional lymph nodes, which can eventually lead to distant metastasis. This process is facilitated by the expression of lymphangiogenic factors and the disruption of the epithelial barrier.

**Why Each Wrong Option is Incorrect**
**Option A:** Direct invasion through the bloodstream (hematogenous spread) is more characteristic of melanoma and certain sarcomas, not SCC.
**Option B:** Metastasis via the neural system is not a common route for SCC.
**Option C:** The role of the hematolymphatic system in SCC spread is more significant than the role of the nervous system.

**Clinical Pearl / High-Yield Fact**
It's essential to recognize that SCC can metastasize through both lymphatic and hematogenous routes, but the lymphatic system is the primary route. Clinicians should consider imaging studies to evaluate regional lymph nodes in patients with SCC.

**Correct Answer:** B.