Ace the HEENT Assessment 2026 – Head-to-Toe Confidence Awaits!

Assessing the temporomandibular joint (TMJ) evaluates the function of cranial nerve V, also known as the trigeminal nerve. This nerve is responsible for sensation in the face and motor functions such as biting and chewing, which involve the muscles that control jaw movement.

During a TMJ assessment, palpation of the joint while the patient opens and closes their mouth helps to observe both the mobility of the joint and the function of the muscles innervated by the trigeminal nerve. This includes assessing any pain, clicking sounds, or limitations in movement that may indicate dysfunction.

The other cranial nerves listed have different functions: cranial nerve VI controls lateral eye movement, cranial nerve VII is involved in facial expression and taste sensations, and cranial nerve VIII is responsible for hearing and balance. Therefore, they are not directly related to the assessment of the TMJ.