**Question:** Cricothyroid is supplied by:

A. Cervical sympathetic chain
B. Superior laryngeal nerve
C. Infrahyoid group of deep cervical nerves
D. Hyoid nerve

**Core Concept:**

Cricothyroid is a muscle located in the larynx, specifically between the thyroid and cricoid cartilages. It plays a crucial role in phonation and swallowing. In the context of the question, we need to identify the nerves that supply the cricothyroid muscle.

**Why the Correct Answer is Right:**

The cricothyroid muscle is supplied by the **Superior Laryngeal Nerve** (Type II branch of the vagus nerve). Option B is correct because the superior laryngeal nerve is responsible for providing motor innervation to the cricothyroid muscle, enabling it to contract and relax, thus enabling phonation and swallowing.

**Why Each Wrong Option is Incorrect:**

- **Cervical Sympathetic Chain** (Option A) is incorrect because it supplies the sympathetic supply to the larynx and upper trachea, not the cricothyroid muscle.
- **Infrahyoid group of deep cervical nerves** (Option C) is incorrect because these nerves supply the infrahyoid muscles and not specifically the cricothyroid muscle.
- **Hyoid nerve** (Option D) is incorrect because the hyoid nerve supplies the hyoid muscle, not the cricothyroid muscle.

**Clinical Pearl:**

Understanding the innervation of the cricothyroid muscle is important for recognizing potential complications during surgical procedures in the neck, such as those involving the thyroid gland or larynx. Knowledge of these anatomic details helps in anticipating potential injuries during surgical procedures and minimizing complications.