CRANIAL NERVES (E3) Flashcards
Cranial Nerve I
Olfactory
Cranial Nerve II
Optic
Cranial Nerve III
Oculomotor
Cranial Nerve IV
Trochlear
Cranial Nerve V
Trigeminal
What are the 3 branches of Trigeminal N?
- Opthalmic
- Maxillary
- Mandibular
Cranial Nerve VI
Abducens
Cranial Nerve VII
Facial
Cranial Nerve VIII
Vestibulocochlear
Cranial Nerve IX
Glossopharyngeal
Cranial Nerve X
Vagus
Cranial Nerve XI
Spinal Accessory
Cranial Nerve XII
Hypoglossal
What is CN I sensory to?
olfactory epithelium
CN I = opthalmic
What is CN II sensory to?
vistion from retina
CN II = optic
What is CN III motor to?
D, V, M rectus muscles of the eye, ventral oblique, and levator palpebrae superioris.
Parasympathetic (autonomic motor) to the iris sphincter m.
CN III = oculomotor
What is CN IV motor to?
dorsal oblique m
CN IV = trochlear
Which is the only branch of trigeminal with moth sensory and motor?
mandibular br.
CN V = Trigeminal
What is the Opthalmic br. of CN V sensory to?
globe (including cornea), periorbita, nasal mucosa, and the medial aspect of palpebrae
CN V = Trigeminal
What is the Maxillary br. of CN V sensory to?
upper lip, nasal mucosa, lateral aspect of palpebrae
CN V = Trigeminal
What is the Mandibular br. of CN V sensory to?
lower jaw and auriculotemporal area
CN V = Trigeminal
What is the Mandibular br. of CN V motor to?
muscles of mastication
CN V = trigeminal
What is CN VI motor to?
retractor bulbi m, lateral rectus m
CN VI = Abducens
What is CN VII motor to?
muscles of facial expression, amd parasympathetic (autonomic motor) to the salivary and lacrimal glands
CN VII = Facial
What is CN VII sensory to?
taste from the rostral 2/3 of the tongue
CN VII = Facial
What is CN VIII sensory to?
hearing and balance
CN VIII = Vestibulocochlear
What is CN IX sensory to?
tongue and pharyngeal mucosa
CN IX = Glossophayngeal
What is CN IX motor to?
pharynx and parasympathetic (autonomic motor) to parotid and mucosal glands
CN IX = Glossopharyngeal
What is CN X motor to?
pharynx, esophagus, and parasympathetic (autonomic motor) to the thorax and abdomen
CN X = Vagus
What is CN X sensory to?
ear canal, epiglottis, thorax, abdomen
What is CN XI motor to?
trapezius, omotransversarius, sternocephalicus, cleidocephalicus, larynx, and recurrent laryngeal n.
CN XI = Spinal Accessory
What is CN XII motor to?
extrinsic and intrinsic muscles of the tongue
Olfactory N passes through ?
passes through foramina in the cribiform plate of the ethmoid bone
Optic n passes through ?
optic canal
Oculumotor n passes through ?
Orbital fissure
Trochlear n passes through ?
Orbital fissure
Opthalmic br of Trigeminal n passes through ?
Orbital fissure
Maxillary br of Trigeminal n passes through ?
Rostral alar foramen via round foramen
Mandibular br of Trigeminal n passes through ?
Oval foramen
Abducens n passes through ?
Orbital fissure
Facial n passes through ?
Stylomastoid foramen and interna, acoustic meatus
“If you’re smilin’, you’re stylin’”
Vestibulocochlear n passes through ?
internal acoustic meatus
Glossopharyngeal n passes through ?
Tympanooccipital fissure via the jugular foramen
Vagus n passes through ?
Tympanooccipital fissure via jugular foramen
Spinal Accessory n passes through ?
Tympanooccipital fissure via the jugular foramen
Hypoglossal n passes through ?
Hypoglossal canal
How to test for olfactory n?
cotton ball with alcohol, looking for a sniffing action
How to test for optic n?
menace response (CN II sensory, CN VII motor), obstacle course, pupillary light reflex (CN II sensory, CN III motor)
How to test for Oculomotor n?
look for tracking, strabismus if DVM rectus muscles affected, droopy eyelid if levator palpebrae superioris is affected, oblique deviation of eye if ventral oblique is affected, absence of miosis (pupillary contraction) when light shined in
How to test for Trochelar n?
oblique deviation if dorsal oblique is affected
How to test Opthalmic br of Trigeminal?
corneal reflex, palpebral reflex on medial canthus
How to test Maxillary br of Trigeminal?
lateral canthus palpebral reflex
upper lip/nasal mucosa response
How to test Mandibular br of Trigeminal?
lower lip/jaw (pinch and see response) to test sensory
atrophy of muscles of mastication
look for drop jaw
How to test for Abducens n?
corneal reflex - if no 3rd eyelid comes up then test the opthalmic br of trigeminal
medial strabismus if lateral rectus muscle innervation affected
How to test for Facial n?
mainly testing motor- look for facial expression! eyebrows, ears, palpebrae, lips, etc.
How to test for Vestibulocochlear n?
vestibular portion - balance, posture, etc. May see circling, head tilt, nistagmus…
cochlear portion - test hearing, make noise (out of sight)
How to test for Glossopharyngeal n?
gag reflex - open the mouth and put finger toward back of the tongue, looking for a wretch
(gag reflex sensation of CN IX and motor of CN X)
How to test for Vagus n?
listen to HR and gut sounds, will need to hear something very wrong like tachycardia (HR increase w lesion, gut sounds decrease w lesion)
test motor with gag reflex
often don’t test ear canal
How to test for Spinal Accessory n?
look for atrophy to skeletal muscles that it innervates
How to test for Hypoglossal n?
watch dog drink water or lick something, grab dog’s tongue and see if you can pull it out of the mouth
What are the branches of the mandibular nerve (a br of Trigeminal)
inferior alveolar n, lingual n, auriculotemporal n
What does the inferior alveolar n innervate?
mandibular teeth. also gives off mental nerves that exit the mental foramina
What does the lingual nerve innervate?
base of the tongue (pain, touch, temperature from the rostral tongue)
What does the auriculotemporal nerve innervate?
auricle and skin rostral to the auricle (sensation)
Dysfunction of which 2 CN can lead to dysphagia? (difficulty swallowing)
CN IX, CN X
