Unilateral Trigeminal nerve injury is tested by mcq given below:
Q. Unilateral Trigeminal nerve injury is tested by(a) elevation and Lowering of jaw
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| Do you Agree with Answer comment below |
🧠 Testing the Trigeminal Nerve (CN V)
Let’s understand this in a very simple way.
What is the trigeminal nerve?
The trigeminal nerve is the 5th cranial nerve (CN V).
It is responsible for:
- Sensation of the face
- Movements of chewing muscles
How is the trigeminal nerve tested?
✅ Correct Answer: (a) Elevation and Lowering of Jaw
Why?
The trigeminal nerve supplies the muscles of mastication (chewing).
👉 To test its motor function, the nurse asks the patient to:
- Open and close the mouth
- Elevate and lower the jaw
- Clench the teeth
Weakness or deviation of the jaw may indicate trigeminal nerve injury.
Why other options are not correct?
- (b) Inability to tense the jaw → ❌ This is a possible finding, not the test itself
- (c) Blinking of eye → ❌ Mainly involves facial nerve (CN VII)
- (d) Corneal reflex → ❌ Tests sensory CN V and motor CN VII together, not the primary motor test
Simple Exam Trick:
Trigeminal nerve = Chewing muscles → Test by moving the jaw up and down
📌 Disclaimer: For exam preparation only. Follow neurological assessment guidelines in clinical practice.
💚 Exam Objective Nursing – Asha D
Concept clarity • Easy recall • Nursing success