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Commonly asked in USMLE is the different nerves that supply the auricle and the surrounding skin.

The auriculotemporal nerve supplies the anterior upper part of the auricle and the adjacent temporal skin, it's a branch of the trigeminal mandibular.
The lesser occipital nerve supplies the posterior upper part of the auricle and the adjacent cranial surface, it originates from C2 spinal nerves.
The greater auricular nerve supplies the lower half anteriorly and posteriorly, it originates from C2, C3 spinal nerves.
The external auditary meatus is supplied by the auriculotemporal nerve anteriorly and the auricular branch of the vagus posteriorly.

Here's an illustration that helps

click thumbnail to enlarge
Facial expression Human body Jaw Organism Gesture
 
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