**Core Concept**
The question is testing the knowledge of the intrinsic and extrinsic muscles of the tongue, specifically their origins and insertions. The correct answer requires understanding of the anatomy of the tongue and its associated muscles.

**Why the Correct Answer is Right**
The **genioglossus** muscle is one of the extrinsic muscles of the tongue, responsible for its protrusion. However, it is not the correct answer to this question. The muscle that runs from the dorsum of the tongue to the ventral surface is actually the **hyoglossus**, but it's not the only one. The **digastric part of the hyoglossus** originates from the posterior surface of the hyoid bone and inserts onto the lateral surface of the tongue. This part of the muscle indeed runs from the dorsum to the ventral surface, but another muscle also does the same. The **geniohyoid** muscle, which is also an extrinsic muscle of the tongue, primarily involved in the elevation of the hyoid bone, has a part of it that runs from the dorsal surface of the tongue to the ventral surface, but **the correct answer is the part of the muscle that is more specifically related to its function**. Specifically, it is the **digastric part of the hyoglossus**, but the question might be asking about the **part of the tongue that is more involved in the action**. The correct answer is actually the **digastric part of the hyoglossus**, but the question is referring to **the part of the muscle that does the action**.

**Why Each Wrong Option is Incorrect**
* **Option A:** Incorrect because it doesn't run from the dorsum to the ventral surface. The muscle that is more likely to be correct is the one that is more specifically related to the action.
* **Option B:** Incorrect because it doesn't have a part that runs from the dorsum to the ventral surface. This muscle is more involved in the elevation of the hyoid bone.
* **Option C:** Incorrect because it doesn't have a part that runs from the dorsum to the ventral surface. This muscle is more involved in the protrusion of the tongue.

**Clinical Pearl / High-Yield Fact**
The intrinsic and extrinsic muscles of the tongue work together to facilitate various functions such as speaking, swallowing, and eating. Understanding the anatomy and physiology of these muscles is crucial for diagnosing and managing tongue-related disorders.

**Correct Answer: D. The digastric part of the hyoglossus.**