Nerve supply of the tympanic membrane is by –
**Core Concept**
The tympanic membrane, also known as the eardrum, receives its nerve supply from branches of the cranial nerves. The **tympanic plexus**, formed by the **tympanic branch of the glossopharyngeal nerve (Jacobson's nerve)**, plays a crucial role in the sensory innervation of the tympanic membrane.
**Why the Correct Answer is Right**
The correct answer is related to the **tympanic branch of the glossopharyngeal nerve (CN IX)**, which provides the primary sensory innervation to the tympanic membrane. This nerve is responsible for transmitting sensory information from the eardrum to the central nervous system.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not specifically related to the nerve supply of the tympanic membrane.
**Option B:** Incorrect as it does not accurately describe the nerve supply.
**Option D:** Incorrect because it is not relevant to the tympanic membrane's nerve supply.
**Clinical Pearl / High-Yield Fact**
The nerve supply of the tympanic membrane is essential for the diagnosis of certain ear conditions, such as **otitis media**.
**Correct Answer:** C. Jacobson's nerve