QuestionSBA
QuestionChoice
The trigeminal nerve serves both sensory (facial sensation) and motor innervation to several muscles, including the muscles of mastication (masseter, temporalis, medial pterygoid and lateral pterygoid) as well as the anterior belly of digastric, mylohyoid, tensor tympani & tensor veli palatini. It does not affect pupillary constriction or dilation.
10026499
e
Trigeminal nerve
QuestionChoice
The oculomotor nerve innervates the levator palpebrae superioris, inferior oblique and superior, medial and inferior recti muscles. It is responsible for pupillary constriction and contains parasympathetic fibres which innervate the sphincter pupillae and ciliary muscles. If the oculomotor nerve was affected on the left side, the right eye would still constrict.
10026497
c
Oculomotor nerve
QuestionChoice
The trochlear nerve provides motor innervation to the superior oblique muscle. It does not affect pupillary constriction or dilation.
10026496
b
Trochlear nerve
QuestionChoice
The patient has presented with a relative afferent pupil defect (RAPD), common in conditions such as optic neuritis. It is caused by injury to the optic nerve. Normal optic function causes bilateral pupil constriction when light is shone, and bilateral pupil dilation when light is removed.
10026495
a
Optic nerve
QuestionChoice
The Abducens nerve provides motor innervation to the lateral rectus muscle. It does not affect pupillary constriction or dilation.
10026498
d
Abducens nerve
Concept
Chapter
2693
3745
Multiple Sclerosis
Topic
141
Neurology
17697
A 27-year-old female presents to the hospital with worsening visual acuity over the last few days and the sensation of colours seeming duller. She is very concerned that she is losing her vision.

On examination, when shining the light into the right eye. both pupils constrict, however, when shining it in the left eye, both eyes remained dilated.

Which cranial nerve is affected?
a