## **Core Concept**
The external auditory meatus, also known as the external auditory canal, receives its sensory innervation from multiple sources due to its embryological development from different layers. The sensory supply is crucial for the transmission of sensory information from this area to the central nervous system.

## **Why the Correct Answer is Right**
The correct answer, **C. Auriculotemporal nerve and Arnold's nerve (branch of vagus)**, is accurate because the external auditory meatus receives its sensory innervation from both the auriculotemporal nerve (a branch of the mandibular division of the trigeminal nerve, CN V3) and Arnold's nerve, which is a branch of the vagus nerve (CN X). The auriculotemporal nerve provides sensory innervation to the anterior part of the external auditory meatus, while Arnold's nerve supplies the posterior part.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately represent the nerves responsible for the sensory supply of the external auditory meatus.
- **Option B:** This option is incorrect as it likely includes nerves not primarily responsible for the sensory innervation of the external auditory meatus.
- **Option D:** This option is incorrect because it does not specify the correct nerves involved in the sensory supply.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the sensory innervation of the external auditory meatus is derived from multiple cranial nerves, specifically the trigeminal nerve (via the auriculotemporal nerve) and the vagus nerve (via Arnold's nerve). This dual innervation is important for the clinical assessment and management of conditions affecting this area.

## **Correct Answer:** C. Auriculotemporal nerve and Arnold's nerve (branch of vagus).