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level: Lecture 4: Cranial Nerves Exam (CN IV - V)

Questions and Answers List

level questions: Lecture 4: Cranial Nerves Exam (CN IV - V)

Question	Answer
In order to test sensitivity of these divisions, you can use your finger, or an orange pin (medical clinic supply type). Name these areas (image).	Opthalmic, Maxillary, Mandible
The Corneal Reflex is which two nerves?	CN V and CN VII
When testing the corneal reflex with a cotton ball, do you test the cornea or the sclera??	Cornea (coloured part)
CN V (motor) mainly affects which area: Ophthalmic, Mandible, Maxillary	Mandible (muscles of mastication)
True or false: Fifth-nerve palsies are very common in isolation.	False. They are typically rare in isolation.
True or False: When opening the jaw, palsy of the nerve causes deviation of the jaw AWAY from the side of the lesion	False. The jaw deviates TOWARDS the lesion side.
Describe the "Jaw jerk" test	Put your forefinger gently on the patient’s loosely opened jaw. Tap your finger gently with a tendon hammer. Explain the test to the patient or relaxation of his jaw will be impossible. Normally, the jaw will not jerk much, unless there is a lesion.
What is this image showing a weakness in (what muscle)?	Weak right pterygoid. Deviates towards the weak side.
CN V is often called the ________ nerve.	Trigeminal Nerve
What would someone's face look like if they had a Lower motor neuron lesion?	One half or one quadrant of their face would droop, due to muscle palsy.
CN VII is the _______ nerve.	Facial
What would someone's face look like if they had an Upper motor neuron lesion?	This would cause one lower quadrant (on the effected side) to droop. It's important to note that UPPER motor neuron lesions affect ONLY the LOWER face. This is because the part of the facial nucleus controlling the upper half of the face is bilaterally innervated.
Upper or Lower left-side motor neuron lesion?	Lower
Upper or Lower left-side motor neuron lesion?	Upper
When testing CN VII's taste capabilities, what are the 3 taste types used in the experiment?	Sweet, Salty, Sour