Cranial Nerves Flashcards
which nerves exit cerebrum
olfactory and optic
where do the cranial nerves that don’t exit the cerebrum exit from?
brainstem
3 divisions of trigeminal nerve
ophthalmic, maxillary, mandibular
CNI
Olfactory
CNII
Optic
CNIII
Oculomotor
CNIV
Trochlear
CNV
Trigeminal
CNV1
Ophthalmic
CNV2
Maxillary
CNV3
Mandibular
CNVI
Abducens
CNVII
Facial
CNVIII
Vestibulocochlear
CNIX
Glossopharyngeal
CNX
Vagus
CNXI
Spinal accessory
CNXII
Hypoglossal
Olfactory exits through
cribriform plate
Optic exits through
optic canal
oculomotor exits through
superior orbital fissure
trochlear exits through
superior orbital fissure
ophthalmic exits through
superior orbital fissure
abducens exits through
superior orbital fissure
which nerves exit through superior orbital fissure
oculomotor, trochlear, ophthalmic, abducens
maxillary exits through
foramen rotundum
mandibular exits through
foramen ovale
facial exits through
internal acoustic meatus
vestibulocochlear exits through
internal acoustic meatus
which nerves exit through internal acoustic meatus
facial, vestibulocochlear
glossopharyngeal exits through
jugular foramen
vagus exits through
jugular foramen
accessory exits through
jugular foramen
which nerves exit through the jugular foramen
glossopharyngeal, vagus, accessorry
hypoglossal exits through
hypoglossal canal
olfactory nerve function
special sense of smell
which nerves transmit parasympathetic information
III, VII, IX, X
optic nerve function
special sense of vision
oculomotor nerve function
motor to most extraocular muscles, parasympathetic to pupillary sphincter and ciliary eye muscles
trochlear nerve function
motor to superior oblique muscle of eye
abducens nerve function
motor to lateral rectus muscle of eye
vestibulocochlear nerve function
special sense of hearing and balance
glossopharyngeal nerve function
sensory to posterior 1/3 of tongue, palate, oropharynx (afferent gag reflex), motor to pharynx, special sense of taste from posterior 1/3 of tongue, parasympathetic to parotid gland
vagus nerve function
sensory to external ear, larynx, esophagus. Motor to pharynx, larynx, palate, esophagus (efferent gag reflex). Parasympathetic to thoracic and abdominal organs
spinal accessory nerve function
motor to sternocleidomastoid and trapezius
hypoglossal function
motor to tongue
which nerve is parasympathetic to pupillary response
oculomotor
which nerves are motor to eye movements
oculmotor, trochlear, abducens
which nerves are parasympathetic to salivary glands
facial, glossopharyngeal
which nerves are special sense of taste
facial (anterior 2/3), glossopharyngeal (posterior 1/3)
which nerves comprise gag reflex
glossopharyngeal (afferent), vagus (efferent)
which nerves are sensory to tongue
mandibular division of trigeminal (anterior 2/3) glossopharyngeal (posterior 1/3)
which nerves are involved in swallowing
glossopharyngeal, vagus
2 sensory branches of ophthalmic division
frontal nerve, branches to cornea and conjunctiva
course of frontal nerve
runs in superior aspect of orbit, gives off lacrimal nerve branch, exits orbit and becomes supraorbital nerve
supraorbital nerve innervates
sensory to part of the face
two sensory branches of maxillary division
infraorbital, superior alveolar
infraorbital nerve course
runs in inferior aspect of orbit, passes through infraorbital foramen
infraorbital nerve innervates
sensory to part of face
superior alveolar nerve innervates
sensory to upper teeth, some sinuses, nasal mucosa
four sensory branches of mandibular division
buccal, auricotemporal, lingual, inferior alveolar
inferior alveolar nerve becomes
mental nerve
buccal nerve innervates
sensory to inside of mouth and cheek
auricotemporal nerve innervates
sensory to skin around external ear, postganglionic parasympathetic to parotid gland
lingual nerve innervates
sensory to anterior 2/3 of tongue
inferior alveolar nerve innervates
sensory to lower teeth
course of inferior alveolar nerve
runs with mandible, exits mandible via mental foramen, becomes mental nerve
mental nerve innervates
sensory to region of lower lip and face
motor innervation of mandibular nerve
muscles of mastication
muscles of mastication include
temporalis, masseter, medial/lateral pterygoid
muscles of mastication are innervated by
mandibular division of trigeminal nerve
course of facial nerve
exits cranial cavity via internal acoustic meatus, descends through facial canal in petrous portion of temporal bone and gives off motor branch to stapedius, exits skull via stylomastoid foramen
stapedius muscle function
dampens the sound received by tympanic membrane
where does the facial nerve split into its 5 branches
after exiting the stylomastoid foramen as it runs posterior to the parotid gland
5 terminal branches of facial nerve
temporal, zygomatic, buccal, marginal mandibular, cervical
what do the 5 terminal branches of facial nerve do
innervate muscles of facial expression
5 terminal branches of facial nerve make up the
parotid plexus
temporal branch of facial nerve innervates
occipitofrontalis, orbicularis oculi
action of occipitiofrontalis
elevates eyebrows, wrinkles skin of forehead, draws scalp backwards
action of orbicularis oculi
closes eyelids
zygomatic branch of facial nerve innervates
orbicularis oculi
buccal branch of facial nerve innervates
orbicularis oris, buccinator, zygomaticus major
orbicularis oris action
compresses and protrudes lips
buccinator action
presses cheek against lips
zygomaticus major action
smiling
marginal mandibular branch of facial nerve innervates
mentalis
mentalis action
elevates and protrudes lower lip
cervical branch of facial nerve innervates
platysma
platysma action
depresses and wrinkles skin of lower face and mouth, tenses skin of neck
branch of facial nerve that provides for sense of taste from anterior 2/3 of tongue
chorda tympani
location of cell bodies of chorda tympani
facial ganglion
course of axons of chorda tympani
join lingual branch of V3 to reach tongue
Peripheral ganglia for parasympathetics in the head
ciliary, pterygopalatine, submandibular, otic
origin of sympathetics to head and neck
T1-T2
synapse point for sympathetics to head and neck
superior cervical ganglion
CNIII synapses at the (ps)
ciliary ganglion
CNVII synapses at the (ps)
pterygopalatine ganglion, submandibular ganglion
parasympathetics coming from ciliary ganglion innervate
pupillary constrictor, ciliary muscle
parasympathetics coming from pterygopalatine ganglion innervate
lacrimal gland
parasympathetics coming from submandibular ganglion innervate
submandibular and sublingual glands
parasympathetics coming from the otic ganglion innervate
parotid gland
sympathetics coming from the superior cervical ganglion innervate
pupillary dilator, skin of head and neck
autonomic functions of facial nerve
parasympathetic innervation of lacrimal gland, submandibular/sublingual salivary glands
how does facial nerve innervate lacrimal gland
within the proximal facial canal it gives off the greater petrosal nerve which synapses at the pterygopalatine ganglion. Postsynaptic fibers join lacrimal nerve to innervate lacrimal gland
how does facial nerve innervate submandibular and sublingual glands
the chorda tympani branch off and synapse at submandiublar ganglion and the postganglionic fibers innervate the two glands
autonomic functions of glossopharyngeal nerve
parasympathetics to parotid gland
glossopharyngeal nerve runs with what nerve to provide parasympathetic innervation to parotid gland
auriculotemporal nerve
autonomic functions of oculomotor nerve
pupillary constriction, ciliary muscle