The Question is from neet-zoology structural-organisation-in-animals frog, and it was created by the author T HARITHA

Question

In a frog, the nerve supplying the tympanic membrane and the lining of the buccal cavity originates from which cranial nerve?

T HARITHA · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
	**Primary Concept**: Cranial Nerve Anatomy and Function
	**Related Topics**: Frog Anatomy, Sensory Systems, Neuroanatomy
	**Prerequisites**: Basic knowledge of cranial nerves and their functions.
## SOLUTION PATHWAY
**Given Information**:
	The question asks about the cranial nerve that innervates the tympanic membrane (eardrum) and the lining of the buccal cavity (mouth) in a frog.
**Method & Steps**:
	1. **Identify Cranial Nerves related to head and neck**: Several cranial nerves innervate structures in the head and neck region.
		Reasoning:  We need to focus on cranial nerves associated with sensory functions in the head.
	2. **Analyze the function of each relevant cranial nerve**:
		Working:
			* Trigeminal Nerve (V): Primarily involved in facial sensation and chewing.
			* Facial Nerve (VII):  Involved in facial expression, taste in the anterior two-thirds of the tongue, and innervation of the tympanic membrane and some salivary glands.  Crucially, it also innervates the lining of the buccal cavity.
			* Vagus Nerve (X):  Innervates a wide range of organs in the thorax and abdomen, as well as some structures in the head and neck, including the larynx and pharynx.
			* Glossopharyngeal Nerve (IX):  Involved in taste in the posterior one-third of the tongue, swallowing, and sensation in the pharynx.
		Key Point: The facial nerve (VII) has a branch called the chorda tympani that innervates the tympanic membrane and plays a role in taste.  It also innervates the buccal cavity.
	3. **Select the Correct Nerve**:
		Result: The Facial Nerve (VII) is responsible for the sensory innervation of both the tympanic membrane and the buccal cavity lining in a frog.
		Verification: This aligns with established anatomical knowledge regarding the function of the facial nerve in amphibians.
## OPTION ANALYSIS
[A] :x: Trigeminal Nerve (V): While involved in head sensation, it doesn't innervate the tympanic membrane or the buccal cavity lining.
[B] ✓: Facial Nerve (VII): Correct, as explained above.
[C] :x: Vagus Nerve (X): Primarily involved in the parasympathetic innervation of thoracic and abdominal viscera, not the tympanic membrane or buccal cavity.
[D] :x: Glossopharyngeal Nerve (IX):  Involved in taste and sensation in the posterior tongue and pharynx, not the tympanic membrane or buccal cavity lining.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing the roles of the Trigeminal (V) and Facial (VII) nerves: Both are involved in head functions, but their specific territories differ.
			How to avoid: Focus on the distinct functions of each nerve, particularly regarding sensory innervation of specific structures.
		2. Overlooking the chorda tympani branch of the Facial nerve (VII): This branch is key to understanding the nerve's role in taste and tympanic membrane innervation.
			How to avoid: Remember that the chorda tympani is a crucial component of the Facial nerve's function.
	**Quick Tips**:
		1. Remember 'Facial' for 'Face', including some structures related to hearing and taste within the facial region.
		2. The chorda tympani is a key identifier for the Facial nerve (VII)'s involvement with the tympanic membrane.

T HARITHA · Answer

Trigeminal Nerve (V)

T HARITHA · Answer

The correct Option is "Facial Nerve (VII)"

T HARITHA · Answer

Vagus Nerve (X)

T HARITHA · Answer

Glossopharyngeal Nerve (IX)

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