CSD 210 TEST QUESTIONS AND ANSWERS
LATEST UPDATE
I Cranial Nerve
Olfactory SVA
II Cranial Nerve
Optic SVA
III Cranial Nerve
Oculomotor GSE, GVE
IV Cranial Nerve
Trocholear GSE
V Cranial Nerve
Trigeminal GSE, GSA
VI Cranial Nerve
Abducens GSE
VII Cranial Nerve
Facial SVE, GVE, SVA, GVA, GSA
VIII Cranial Nerve
Vestibulocochlear SSA
IX Cranial Nerve
Glossopharyngeal SVE, GVE, SVA, GSA, GVA
X Cranial Nerve
Vagus SVE, GVE, SVA, GVA, GSA
XI Cranial Nerve
Spinal Accessory SVE
XII Cranial Nerve
Hypoglossal GSE
Where does cranial nerve nuclei live within the Medulla?
IX, X, XI, XII
Where does cranial nerve nuclei live within the pons?
V, VI, VII, VIII
Where does cranial nerve nuclei live within the midbrain?
III, IV
Function of Olfactory Nerve (I)
Smell
What happens if olfactory nerve (I) is damaged?
A lesion that disrupts CN I causes anosmia, a condition where the
ability to smell is partially or fully impaired. Two associated conditions are
hypsomia (reduced sense of smell) or hypersomia (acute sense of smell)
Function of Optic Nerve (II)
Sight
What happens if optic nerve (II) is damaged?
Visual deficits, loss of monocular vision if before the chiasm
, Function of oculomotor nerve (III)
(GSE) Eye movement, maintains open eyelid (GVE): Responsible for reflexive
constriction of pupil, accommodation of lens for near vision
What happens if oculomotor nerve (III) is damaged?
Paralysis of external ocular muscles. This results in deviation of
the ipsilateral muscle to the lateral side and ptosis in which the eyelid droop.
Most likely to have difficulty looking up, down and medially with affected eye
Function of trochlear nerve (IV)
eye movement (regulates superior oblique)
What happens if trochlear nerve is damaged?
Results in paralysis of the superior oblique muscle, causing
difficulty in looking downward and outward. The eye is fixed with upward
medial gaze because the actions of the remaining muscles are unopposed.
Function of trigeminal nerve (V)
(Sensory) Pain and temperature and
touch/proprioception from the IPSI side of face/forehead, teeth, anterior 2/3 of tongue,
palate (Motor) muscles of mastication
What happens if trigeminal nerve (V) is damaged?
(Sensory Deficits) Trigeminal neuralgia, sneezing and blinking reflexes lost, damage to
peripheral branch results in an ipsilateral loss of sensation in the area of distribution of
the nerve, lesions in the caudal spinal tract and nucleus V result in IPSI deficits in pain
and temperature from the face, teeth, and anterior 2/3 of tongue and palate
(Motor deficits): Paralysis of paresis and atrophy of masticatory muscles on the IPSI
side
Function of abducens (VI) nerve
responsible for lateral gaze movement. Innervates
lateral rectus
What happens if abducens nerve (VI) is damaged?
Affected eye to turn in medially, since the medial rectus muscle is unopposed
Function of Facial Nerve (VII)
Primarily a motor nerve for facial muscles and stapedius muscle, but also contains a
sensory component
Function of vestibulocochlear nerve (VIII)
Hearing, Equilibrium and orientation in space
What happens if vestibulocochlear nerve (VIII) is damaged?
disturbances with equilibrium and audition
(Impaired equilibrium, vertigo or dizziness and nystagmus)
Function of glossopharyngeal nerve (IX)
Controls muscles of larynx, pharynx, soft palate
for phonation, swallowing and resonance
What happens if glossopharyngeal nerve (IX) is damaged?
Atrophy (LMN) and paralysis of innervated muscles, producing hyper nasality,
dysphasia, dysphonia, and deviation of the uvula toward the
contra side (strong side)
What is the function of the Spinal Accessory nerve (XI)?
LATEST UPDATE
I Cranial Nerve
Olfactory SVA
II Cranial Nerve
Optic SVA
III Cranial Nerve
Oculomotor GSE, GVE
IV Cranial Nerve
Trocholear GSE
V Cranial Nerve
Trigeminal GSE, GSA
VI Cranial Nerve
Abducens GSE
VII Cranial Nerve
Facial SVE, GVE, SVA, GVA, GSA
VIII Cranial Nerve
Vestibulocochlear SSA
IX Cranial Nerve
Glossopharyngeal SVE, GVE, SVA, GSA, GVA
X Cranial Nerve
Vagus SVE, GVE, SVA, GVA, GSA
XI Cranial Nerve
Spinal Accessory SVE
XII Cranial Nerve
Hypoglossal GSE
Where does cranial nerve nuclei live within the Medulla?
IX, X, XI, XII
Where does cranial nerve nuclei live within the pons?
V, VI, VII, VIII
Where does cranial nerve nuclei live within the midbrain?
III, IV
Function of Olfactory Nerve (I)
Smell
What happens if olfactory nerve (I) is damaged?
A lesion that disrupts CN I causes anosmia, a condition where the
ability to smell is partially or fully impaired. Two associated conditions are
hypsomia (reduced sense of smell) or hypersomia (acute sense of smell)
Function of Optic Nerve (II)
Sight
What happens if optic nerve (II) is damaged?
Visual deficits, loss of monocular vision if before the chiasm
, Function of oculomotor nerve (III)
(GSE) Eye movement, maintains open eyelid (GVE): Responsible for reflexive
constriction of pupil, accommodation of lens for near vision
What happens if oculomotor nerve (III) is damaged?
Paralysis of external ocular muscles. This results in deviation of
the ipsilateral muscle to the lateral side and ptosis in which the eyelid droop.
Most likely to have difficulty looking up, down and medially with affected eye
Function of trochlear nerve (IV)
eye movement (regulates superior oblique)
What happens if trochlear nerve is damaged?
Results in paralysis of the superior oblique muscle, causing
difficulty in looking downward and outward. The eye is fixed with upward
medial gaze because the actions of the remaining muscles are unopposed.
Function of trigeminal nerve (V)
(Sensory) Pain and temperature and
touch/proprioception from the IPSI side of face/forehead, teeth, anterior 2/3 of tongue,
palate (Motor) muscles of mastication
What happens if trigeminal nerve (V) is damaged?
(Sensory Deficits) Trigeminal neuralgia, sneezing and blinking reflexes lost, damage to
peripheral branch results in an ipsilateral loss of sensation in the area of distribution of
the nerve, lesions in the caudal spinal tract and nucleus V result in IPSI deficits in pain
and temperature from the face, teeth, and anterior 2/3 of tongue and palate
(Motor deficits): Paralysis of paresis and atrophy of masticatory muscles on the IPSI
side
Function of abducens (VI) nerve
responsible for lateral gaze movement. Innervates
lateral rectus
What happens if abducens nerve (VI) is damaged?
Affected eye to turn in medially, since the medial rectus muscle is unopposed
Function of Facial Nerve (VII)
Primarily a motor nerve for facial muscles and stapedius muscle, but also contains a
sensory component
Function of vestibulocochlear nerve (VIII)
Hearing, Equilibrium and orientation in space
What happens if vestibulocochlear nerve (VIII) is damaged?
disturbances with equilibrium and audition
(Impaired equilibrium, vertigo or dizziness and nystagmus)
Function of glossopharyngeal nerve (IX)
Controls muscles of larynx, pharynx, soft palate
for phonation, swallowing and resonance
What happens if glossopharyngeal nerve (IX) is damaged?
Atrophy (LMN) and paralysis of innervated muscles, producing hyper nasality,
dysphasia, dysphonia, and deviation of the uvula toward the
contra side (strong side)
What is the function of the Spinal Accessory nerve (XI)?
