## Core Concept
The submandibular gland is located in the neck and is surrounded by several important nerves. During surgical excision of the submandibular gland, it is crucial to identify and preserve these nerves to avoid complications. The nerves at risk include the marginal mandibular nerve, the lingual nerve, and the hypoglossal nerve.

## Why the Correct Answer is Right
The correct answer, **D. Auriculotemporal nerve**, is not typically at risk during submandibular gland excision because it is located more posteriorly and laterally, near the parotid gland. The auriculotemporal nerve arises from the mandibular division of the trigeminal nerve and supplies the parotid gland and the skin overlying the temple. In contrast, the marginal mandibular nerve, lingual nerve, and hypoglossal nerve are closely associated with the submandibular gland and are at risk of injury during surgery.

## Why Each Wrong Option is Incorrect
* **Option A: Marginal mandibular nerve** - This nerve is a branch of the facial nerve and runs close to the inferior border of the mandible. It is at risk during submandibular gland excision because of its proximity to the surgical site.
* **Option B: Lingual nerve** - This nerve provides sensation to the anterior two-thirds of the tongue and is closely related to the submandibular gland. It is often encountered and at risk during surgery in this area.
* **Option C: Hypoglossal nerve** - This nerve supplies the muscles of the tongue and passes close to the submandibular gland. It is also at risk during submandibular gland excision due to its anatomical location.

## Clinical Pearl / High-Yield Fact
A key clinical pearl to remember is that the **marginal mandibular nerve** is often the most superficial and therefore at high risk during submandibular gland surgery. Surgeons typically take care to identify and preserve this nerve to prevent postoperative weakness of the muscles of facial expression.

## Correct Answer: D. Auriculotemporal nerve