The nurse is reviewing the function of the cranial nerves (CNS). Which CN is responsible for conducting nerve impulses to the brain for hearing?

A. Ethmoid: The ethmoid sinuses are located between the eyes and are not typically accessible for palpation during a physical examination. Instead, tenderness in this area is assessed through inspection and indirect methods rather than direct palpation.

B. Maxillary: The maxillary sinuses are located in the cheeks and are accessible for palpation. The nurse can assess for tenderness or swelling in this area, which can indicate sinusitis or infection. Palpating the maxillary sinuses is a standard part of the examination for patients with cold and sinus pain.

C. Mastoid: The mastoid process is located behind the ear and contains air cells, but it is not directly involved in sinus pain associated with cold symptoms. While mastoid tenderness may indicate a different type of infection (such as mastoiditis), it is not part of the sinus assessment.

D. Sphenoid: The sphenoid sinuses are located deep within the skull, behind the nasal cavity, and are not accessible for palpation during a physical examination. Any issues with the sphenoid sinuses would typically be assessed through imaging studies rather than physical palpation.

A. Is impaired in a patient with cataracts: Cataracts primarily cause lens opacity, leading to blurry vision and reduced acuity. They do not directly affect extraocular muscle function, which is controlled by cranial nerves rather than the lens.

B. Is always decreased in the older adult: Aging can cause minor changes in eye movement speed and coordination, but significant impairment is not inevitable. Extraocular muscle function remains intact unless affected by neurological conditions such as cranial nerve palsy.

C. Is stimulated by cranial nerves (CNS) I and II: Cranial nerve I (olfactory) is responsible for smell, and cranial nerve II (optic) transmits visual signals to the brain. Neither nerve controls eye movement, which is instead governed by different cranial nerves.

D. Is stimulated by cranial nerves III, IV, and VI: The oculomotor (III), trochlear (IV), and abducens (VI) nerves control extraocular muscle movement. They coordinate eye positioning, alignment, and smooth tracking, ensuring proper function of the visual system.