Which of the following pain is not referred to ear
**Core Concept**
The question is testing the student's knowledge of referred pain, specifically the areas of the body that refer pain to the ear. Referred pain occurs when the pain is perceived in a location other than the site of the painful stimulus, often due to shared nerve roots or convergence of pain pathways.
**Why the Correct Answer is Right**
The ear receives pain input from the trigeminal nerve (cranial nerve V), the facial nerve (cranial nerve VII), and the glossopharyngeal nerve (cranial nerve IX). Pain from the teeth, temporomandibular joint, and external auditory canal is commonly referred to the ear. However, pain from the phrenic nerve (C3-C5) is not referred to the ear.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because pain from the neck and shoulder region can be referred to the ear through the cervical spine and trigeminal nerve.
**Option B:** Incorrect because pain from the face, particularly the trigeminal nerve distribution, is commonly referred to the ear.
**Option C:** Incorrect because pain from the throat and larynx can be referred to the ear through the glossopharyngeal nerve.
**Clinical Pearl / High-Yield Fact**
The "V3" dermatome of the trigeminal nerve, which includes the external auditory canal, is a common source of referred pain to the ear.
**Correct Answer: D. Pain from the phrenic nerve (C3-C5) is not referred to the ear.**