QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
The nurse observes the client moving through the six cardinal fields of gaze by following an object or fingers without the head moving. Which cranial nerves are tested when the nurse is evaluating the client's extraocular movements? (Select all that apply. One, some, or all options may be correct.)
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Answer
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Step 1:Let's solve this systematically:
Step 2:: Understanding Extraocular Movements
Extraocular movements involve the coordinated movement of the eyes in different directions, which requires the precise functioning of specific cranial nerves.
Step 3:: Cranial Nerves Involved in Eye Movement
The primary cranial nerves responsible for eye movements are:
Step 4:
Cranial Nerve III (Oculomotor Nerve) - Controls most eye movements - Innervates superior, inferior, and medial rectus muscles - Also controls the inferior oblique muscle - Responsible for pupil constriction and eyelid elevation
Step 5:
Cranial Nerve IV (Trochlear Nerve) - Controls the superior oblique muscle - Allows downward and inward eye movement
Step 6:
Cranial Nerve VI (Abducens Nerve) - Controls the lateral rectus muscle - Allows lateral (outward) eye movement
Step 7:: Comprehensive Evaluation
When testing the six cardinal fields of gaze, the nurse is specifically assessing the function of Cranial Nerves III, IV, and VI.
Final Answer
- Cranial Nerve III (Oculomotor) - Cranial Nerve IV (Trochlear) - Cranial Nerve VI (Abducens)
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