**Question:** The following statements concerning chorda tympani nerve are true except that it:

A. Innervates the parotid gland and salivary glands.
B. Proves the buccal gustatory function.
C. Terminates in the posterior third of the tongue.
D. Does not play a role in taste perception.

**Core Concept:**
The chorda tympani nerve is a branch of the facial nerve (CN VII) that plays a crucial role in taste sensation. It consists of gustatory fibers that originate from the posterior two-thirds of the tongue and terminate in the anterior two-thirds of the tongue. The nerve is primarily responsible for transmitting taste signals from the posterior two-thirds of the tongue to the central nervous system.

**Why the Correct Answer is Right:**
Correct answer D is true because the chorda tympani nerve is indeed involved in taste sensation. The nerve primarily carries gustatory signals from the posterior two-thirds of the tongue, which are crucial for taste perception.

**Why Each Wrong Option is Incorrect:**
A) Option A is incorrect because the chorda tympani nerve does innervate the parotid gland and submandibular glands, but it is not responsible for their function.
B) Option B is incorrect because the chorda tympani nerve does prove the buccal gustatory function, although this is less important compared to its role in transmitting taste signals from the posterior two-thirds of the tongue.
C) Option C is incorrect because the chorda tympani nerve terminates in the anterior two-thirds of the tongue, not the posterior third as stated in this option.

**Clinical Pearl:**
The chorda tympani nerve plays a significant role in taste perception by transmitting signals from the posterior two-thirds of the tongue to the central nervous system. By understanding its function, medical students and healthcare professionals can better comprehend the complexities of taste sensation and its integration with the central nervous system for processing flavor perception.