The correct answer is: c- It joins lingual nerve beneath lateral pterygoid.
Explanation:
1. Chorda Tympani:
- The chorda tympani is a branch of the facial nerve (cranial nerve VII) responsible for carrying taste and parasympathetic fibers.
2. Statements:
a. Correct: It is a branch of the facial nerve.
b. Correct: It does not cross the tympanic membrane but rather runs in the middle ear.
c. Incorrect: The chorda tympani joins the lingual nerve in the infratemporal fossa, not beneath the lateral pterygoid muscle.
d. Correct: It is related to the medial side of the lower third molar during its course.
e. Correct: It carries taste and parasympathetic fibers related to the anterior two-thirds of the tongue.
Therefore, the statement that is incorrect is c- It joins lingual nerve beneath lateral pterygoid.
