Question

The trigeminal nerve is the largest nerve with following branches:
A. Olfactory
B. Ophthalmic
C. Maxillary
D. Mandibular
Choose the most appropriate answer from the options given below:

• A. A, B and D only
• B. B, C and D only
• C. A, B, C and D
• D. A, C and D only

Hint:

The name "trigeminal" itself means "three-twin," referring to its three major branches. You can remember the branches by the part of the face they serve: V1 Ophthalmic (eye area), V2 Maxillary (upper jaw), and V3 Mandibular (lower jaw).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The trigeminal nerve is the fifth cranial nerve (CN V). It is the largest cranial nerve and is a mixed nerve, meaning it has both sensory and motor functions. It is primarily responsible for sensation in the face and motor functions such as biting and chewing. The question asks to identify its main branches.

Step 2: Detailed Explanation:
The trigeminal nerve has three major branches, or divisions:
- Ophthalmic nerve (V1): This is a sensory nerve that supplies the skin of the forehead, scalp, upper eyelid, and the front of the nose. This corresponds to B.
- Maxillary nerve (V2): This is also a sensory nerve. It supplies the skin over the maxilla (upper jaw), the lower eyelid, and the upper lip. This corresponds to C.
- Mandibular nerve (V3): This is a mixed nerve, containing both sensory and motor fibers. It supplies sensation to the skin over the mandible (lower jaw) and side of the head. Its motor fibers innervate the muscles of mastication. This corresponds to D.
- The Olfactory nerve (A) is the first cranial nerve (CN I) and is responsible for the sense of smell. It is not a branch of the trigeminal nerve.

Step 3: Final Answer:
The three branches of the trigeminal nerve are the ophthalmic, maxillary, and mandibular nerves. Therefore, B, C, and D are the correct choices. This corresponds to option (B).