Cranial Nerves Flashcards
how many cranial nerves are there?
12 (paired)
where do the cranial nerves arise?
- oflactory and optic (first 2) - cerebrum
- remaining ten emerge from brainstem
which cranial nerves originate from the cerebrum?
olfactory (CN I)
optic (CN II)
which cranial nerves arise from the brainstem?
CN III - XII
which cranial nerve comes from the posterior side of the midbrain?
trochlear nerve IV
where does the trochlear nerve (CN IV) arise?
posterior side of the midbrain
what cranial nerve arises from the midbrain-pontine junction?
oculomotor (CN III)
where does the oculomotor nerve arise?
midbrain-pontine junction
what cranial nerve arises from the pons?
trigeminal (V)
where does the trigeminal (V) nerve arise?
pons
what cranial nerves arise from the pontine-medulla junction?
abducens (VI)
facial (VII)
vestibulocochlear (VIII)
where do cranial nerves VI-VIII arise?
pontine-medulla junction
what cranial nerves arise from the medulla oblongata posterior to the olive?
glossopharyngeal (IX)
vagus (X)
accessory (XI)
where do the glossopharyngeal, vagus and accessory cranial nerves arise?
medulla oblongata, posterior to the olive
do
where does the hypoglossal nerve arise?
medulla oblongata, anterior to the olive
what cranial nerve arises from the medulla oblongata, anterior to the olive?
hypoglossal (XII)
CN I?
olfactory
CN II?
optic
CN III
oculomotor
CN IV
trochlear
CN V
trigeminal
CN VI
abducens
CN VII
facial
CN VIII
vestibulocochlear
CN IX
glossopharyngeal
CN X
vagus
CN XI
spinal accessory
CN XII
hypoglossal
olfactory
CN I?
optic
CN II?
oculomotor
CN III
trochlear
CN IV
trigeminal
CN V
abducens
CN VI
facial
CN VII
vestibulocochlear
CN VIII
glossopharyngeal
CN IX
vagus
CN X
spinal accessory
CN XI
hypoglossal
CN XII
general somatic afferent/GSA
general sensation from skin
general visceral afferent/GVA
general sensation from the viscera (internal organs in main body cavities, eg. abdomen)
special somatic afferent/SSA
senses derived from ectoderm (sight, sound, balance)
special visceral afferent/SVA
senses derived from the endoderm (taste, smell)
general somatic efferent/GSE
skeletal muscles
general visceral efferent/GVE
smooth muscles of gut and autonomic motor
special visceral efferent/SVE
muscles derived from pharyngeal arches
how many modalities are there for cranial nerves?
7
* 4 sensory/afferent
* 3 motor/efferent
general sensation from skin
general somatic afferent/GSA
general sensation from the viscera (internal organs in main body cavities, eg. abdomen)
general visceral afferent/GVA
senses derived from ectoderm (sight, sound, balance)
special somatic afferent/SSA
senses derived from the endoderm (taste, smell)
special visceral afferent/SVA
skeletal muscles
general somatic efferent/GSE
smooth muscles of gut and autonomic motor
general visceral efferent/GVE
muscles derived from pharyngeal arches
special visceral efferent/SVE
what is the modality of CN I?
