Question

Which of the following is not supplied by the Facial Nerve?

• A. Posterior auricular
• B. Nerve to stapedius
• C. Deep petrosal
• D. Chorda tympani

Hint:

Facial nerve branches: Greater petrosal, Nerve to stapedius, Chorda tympani, Posterior auricularDeep petrosal carries sympathetic fibers from internal carotid plexus.

Answer 1

The Correct Option is C

The question asks which of the given nerves is not supplied by the Facial Nerve. Let us evaluate each option to determine the correct answer.

1. Posterior auricular nerve: The posterior auricular nerve is a branch of the Facial Nerve (Cranial Nerve VII). It supplies motor innervation to some of the muscles around the ear and the stylohyoid and digastric muscles. Thus, this option is supplied by the Facial Nerve.
2. Nerve to stapedius: The nerve to stapedius is another branch of the Facial Nerve. It innervates the stapedius muscle in the middle ear, which helps control the movement of the stapes bone. Therefore, this option is supplied by the Facial Nerve.
3. Deep petrosal nerve: The deep petrosal nerve is not a branch of the Facial Nerve. It arises from the sympathetic plexus on the internal carotid artery and contributes to the formation of the nerve of the pterygoid canal. It is thus not supplied by the Facial Nerve.
4. Chorda tympani: The chorda tympani is also a branch of the Facial Nerve. It carries taste fibers from the anterior two-thirds of the tongue and also innervates some of the salivary glands. This option is supplied by the Facial Nerve.

Based on the explanations above, the correct answer is the Deep petrosal nerve, as it is the only option that is not supplied by the Facial Nerve. This aligns with the correct answer provided.