Card 6 / 27: Neurons of this nucleus have synaptic connections with the nucleus of nerve VII (facial nerve) that are essential for the corneal reflex. If the reflex is absent, because the afferent limb is interrupted, which of the following would be present upon stimulation of the side of the lesion?
A.)
Ipsilateral reflex present, contralateral absent.
B.)
Contralateral present, ipsilateral absent.
C.)
Ipsilateral absent, contralateral absent.
D.)
Ipsilateral present, contralateral present.
Answer:
C.) Ipsilateral absent, contralateral absent.
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The corneal reflex* is important. If it does not occur, the cornea becomes infected (keratitis) and corneal erosion can lead to loss of vision. Blinking and tearing are essential to the health of the cornea. This is the descending nucleus of V where trigeminal axons terminate.
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Ch 06: Head Somatic & Visceral Sensory Systems
Author:
M.D.Stephen VoronLecturer
University of Utah
USA
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