Critical Care Registered Nurse (CCRN) Practice Exam

Which activity is used to assess cranial nerve III, IV, and VI?

1. Writing words

2. Reading a book

3. Following finger movements

4. Listening to sounds

The correct answer is: Following finger movements

The assessment of cranial nerves III (Oculomotor), IV (Trochlear), and VI (Abducens) involves evaluating eye movements and muscle function, which is effectively accomplished by having the patient follow finger movements. This activity tests the integrity of these cranial nerves, as they are responsible for controlling most of the eye's movements, including the ability to follow an object smoothly and accurately. By having the patient track the movement of a finger in various directions (up, down, left, right), the healthcare provider can observe for any weakness or abnormalities in eye movement that could indicate potential neurological issues related to these cranial nerves. Other activities like writing words, reading a book, or listening to sounds do not specifically evaluate the functions of cranial nerves III, IV, and VI, making following finger movements the most appropriate choice for this assessment.