Cranial Nerves Flashcards
CN I
Olfactory
CN II
Optic
CN III
Oculomotor
CN IV
Trochlear
CN V
Tribe I also
CN VI
Abducens
CN VII
Facial
CN VIII
Vestibulocochlear
CN IX
Glossopharyngeal
CN X
Vagus
CN XI
Accessory
CN XII
Hypoglossal
T/F - CN I is covered in meninges and contains CSF specific cells
True, olfactory nerve is not a true cranial nerve as it is part of the telencephalon
Where does the CN I nerve pass thru the skull?
Cribiform plate
What type of nerve fibers in CN I?
Special visceral afferent nerves (viscerosensory)
Where does the CN II pass thru the skull?
Optic canal
T/F CN II fibers always cross at the optic chiasma
False - not always, some will and some will not
What type of nerve fibers in CN II?
special somatic afferent (special somatosensory)
Where does CN II attach to the brain?
Diencephalon
Which muscles do CN III NOT innervate?
Lateral rictus and superior oblique
Where does CN III pass thru the skull?
Superior orbital fissure
What nerve fiber types does CN III contain?
Somatic and visceral motor
The pupillary constrictors consist of what types of nerve fibers?
Visceral motor
T/F CN III has somatic innervation to superior rectus, inferior rectus, medial rectus, and inferior oblique
True
CN III attaches to the brain where?
Mesencephelon
This nerve attaches to the brain at the mesencephalon, passes thru the superior orbital fissure, and arises on the dorsal surface of mesencephalon
CN IV - trochlear
What is innervated by CN IV? Is it somatic or visceral motor control?
Superior oblique, somatic motor control
T/F CN IV is the only CN to have contralateral symptoms
True, because the fibers cross as they emerge from the dorsal.
What symptoms would one experience with a nuclear lesion of CN IV?
Contralateral
What symptoms would one experience with a nerve lesion of CN IV?
Ipsilateral
CN VI passes thru the skull where?
Superior orbital fissure
What nerve fibers is CN VI contain?
Somatic motor control
What does CN VI innervate?
Lateral rectus
T/F CN VI attaches to the brain at the diencephalon
False, attaches at the pontomedullary junction
CN V has how many branches? What are the names of each?
3; ophthalmic, maxillary, mandibular
Where do the three branches of CN V pass thru the skull?
Opthalmic V1 - superior orbital fissure
Maxillary V2 - Foramen rotundum
Mandibular V3 - Foramen ovale
Where does CN V attach to the brain?
Pons
What are the general sensory regions of CN V ?
Anterior 2/3 of tongue, skin of the face, nasal mucosa
What muscles do the CN V innervate?
Muscles of mastication, oral floor muscles
What other CNs join with CN V and hitch hike?
CN VII join on V2 and V3 to get to glands of the face
CN IX joins V3 to get to parotid gland
T/F - Tensor tympani and tensor veil palatine is innervated by CN IV
False, both innervated by CN V
What branches come off of CN V1?
Frontal nerve, nasociliary, lacrimal
What branches come off CN V2?
Zygomatic Infraorbital Posterior alveolar Middle alveolar Anterior superior alveolar
Which nerves off of CN V2 penetrate the maxillary sinus?
Middle alveolar and anterior superior alveolar
Auriculotemporal, buccal, masseteric, deep temporal, and pterygoid branches come off of what CN?
CN V3 - mandibular
What CN runs with the lingual nerve? Where is it going?
Chords tympani (CN VII) is heading toward the submandibular and sublingual glands, and taste buds for anterior 2/3 of tongue
T/F - Inferior alveolar nerve runs lateral to the mandible
False, runs in the mandible as it enters the Mandibular foramen and exits the mental foramen
Mylohoid, anterior digastric have what motor nerve supply?
Inferior alveolar
What sensory fibers run in the inferior alveolar nerve of CN V3?
Sensory fibers to pulp of teeth and also the mental nerve, which is sensory to skin and lip.
What five branches come off of the facial nerve CN VII?
Temporal, zygomatic, buccal, cervical, posterior auricular
CN VII innervates what?
Muscles of facial expression
What branch of CN VII innervates lacrimal and nasal glands?
Greater petrosal nerve
What branch of VII innervates submandibular, sublingual, and taste on anterior 2/3 of tongue?
Chorda tympani
T/F - chorda tympani and the greater pertrosal nerve travel thru petrous part of temporal bone and exit in the stylomastoid foramen
False, these two branches branch off before the rest of CN VII leaves via the stylomastoid foramen
T/F - CN VIII is motor only
False, CN VIII (vestibulocochlear) is sensory only
T/F - CN IX has both motor and sensory nerve fibers
True
Where does CN IX exit the skull?
Jugular foramen
