Which cranial nerve is responsible for sensation in the anterior 2/3 of the tongue?

The cranial nerve responsible for sensation in the anterior two-thirds of the tongue is the trigeminal nerve, which is the fifth cranial nerve (V). Specifically, it is the maxillary and mandibular branches of the trigeminal nerve that provide sensory innervation to this area.

Understanding the anatomy and functions of these cranial nerves is essential. The trigeminal nerve is primarily known for its role in sensation across the face and oral cavity, making it the key player for sensory functions in the anterior portion of the tongue.

In contrast, the facial nerve (VII) is more associated with taste perception from the anterior two-thirds and does not primarily carry sensation. The glossopharyngeal nerve (IX) is responsible for sensation and taste in the posterior one-third of the tongue, while the vagus nerve (X) provides sensory input from areas related to the throat and organs but not the tongue directly. This anatomical knowledge is crucial for understanding how different cranial nerves contribute to sensory functions in the oral cavity.