Okay, let's tackle this anatomy question. The question is about structures that are superficial to the mylohyoid muscle within the anterior digastric triangle. Hmm, first, I need to recall the anatomy of the neck, specifically the submandibular region and the triangles involved.

The anterior digastric triangle is formed by the anterior belly of the digastric muscle, the mylohyoid muscle, and the hyoid bone. The mylohyoid muscle is a thin, flat muscle that forms the floor of the mouth. Structures superficial to it would be those lying above it.

What lies superficial to the mylohyoid? The sublingual gland is located beneath the mucous membrane of the floor of the mouth, so it's on top of the mylohyoid. The submandibular gland's deep part is adjacent to the mylohyoid, but the superficial part is in the submandibular triangle. The lingual artery runs in the submandibular triangle, so maybe it's superficial? Wait, the lingual artery is a branch of the external carotid artery and runs in the anterior digastric triangle. The submandibular lymph nodes are in the submandibular triangle, so maybe not.

Wait, the mylohyoid muscle separates the submandibular space from the sublingual space. So structures in the sublingual space would be superficial to the mylohyoid. The sublingual gland is in the sublingual space. Also, the sublingual artery, a branch of the lingual artery, might be there.

So the answer might be the sublingual gland. Let me check. The sublingual gland is indeed located in the sublingual space, which is superficial to the mylohyoid muscle. The submandibular gland's superficial part is in the submandibular triangle, which is posterior to the anterior digastric triangle. The lingual artery runs in the anterior digastric triangle but is deep to the mylohyoid? Or is it superficial? Wait, the lingual artery is in the anterior digastric triangle but runs along the hyoglossus muscle, which is deep to the mylohyoid. So maybe the lingual artery is deep.

So the main structure superficial to mylohyoid in the anterior digastric triangle is the sublingual gland. The other structures like submandibular gland's superficial part are in a different triangle. Therefore, the correct answer is sublingual gland. The options might have included sublingual gland as one of the choices. Let me confirm: in the anterior digastric triangle, the sublingual space is superficial to the mylohyoid, containing the sublingual gland and ducts. So the answer is sublingual gland.

**Core Concept**
The anterior digastric triangle is bounded by the anterior belly of the digastric muscle, mylohyoid, and hyoid bone. The mylohyoid muscle separates the submandibular (deep) and sublingual (superficial) spaces. Structures in the sublingual space lie superficial to the mylohyoid.

**Why the Correct Answer is Right**
The sublingual gland lies in the sublingual space, superficial to the mylohyoid muscle. It

✓ Correct Answer: D. Mylohyoid aery and nerve