The Functions Of Cranial Nerve Questions
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The Functions Of Cranial Nerve Questions
72 Questions
*106 Questions 106 and 107 concern some of the functions of the cranial nerves.
(a) A patient has double vision (diplopia) and her right eye is turned inwards.
A possible cause is damage to the right abducens (Vlth cranial) nerve.
(b) Paralysis of the upper eyelid can be caused by damage to the oculomotor
(lllrd cranial) nerve.
(c) A drooping left eyelid, seen together with a constricted left pupil and flushing
of the left side of the face, is likely to be caused by damage to the left
oculomotor nerve fibres.
(d) Inability to move the right eye downwards and towards the nose can be the
result of damage to the innervation of the right inferior oblique eye muscle.
(e) Failure to move the eyes together (conjugate deviation) to the right can be
caused by a lesion in the pons on the right side of the brai
The question refers to the diagrams A to C, which show the position of three
different lesions (hatched lines) in the spinal cord at T8.
(a) Following lesion B, there will be paralysis of voluntary movement of the right
leg.
(b) An exaggerated extensor tone will gradually appear two to three weeks after
lesion A.
(c) After lesion C, there will be a loss of pain and temperature sensation, from
dermatomes below T8 on the right half of the body.
(d) In the days immediately following lesion A there will be retention of urine
in the bladder.
(e) A few weeks after lesion A the lower half of the body will be hot and dry
to the touch.
*105 This question is about the light reflex.
(a) When a bright light is shone into one eye, the pupils of both eyes constrict.
(b) The afferent pathway for the pupillary light reflex passes from the retina to
the lateral geniculate nucleus.
(c) Damage to the oculomotor nerve could lead to failure of the pupillary re¬
sponse to light.
(d) Contraction of the sphincter muscle of the iris is brought about by the
noradrenergic sympathetic innervation.
(e) During fixation onto a near object (when accom
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