1: U1 CN's Flashcards
What is CN I?
olfactory nerve
What is CN II?
optic nerve
What is CN III?
oculomotor nerve
What is CN IV?
trochlear nerve
What is CN V?
Trigeminal nerve
What is CN VI?
Abducens (abducent) nerve
What is CN VII?
facial nerve
What is CN VIII?
vestibulocochlear nerve
What is CN IX?
glossopharyngeal nerve
What is CN X?
vagus nerve
What is CN XI?
accessory (spinal accessory) nerve
What is CN XII?
hypoglossal nerve
What is the olfactory CN classified as?
special sensory
How do the olfactory CN fibers travel?
fibers in the olfactory mucosa traverse the cribriform plate and synapse in the olfactory bulb
What is the optic CN (II) classified as?
special sensory
How do the optic CN (II) fibers travel?
from retina, converge on optic disc, carried to optic nerve, chiasma and tract to the LATERAL GENICULATE BODIES
What is the oculomotor CN (III) classified as?
motor; somatic and parasympathetic
What does the oculomotor CN supply?
5 somatic muscles, 2 visceral smooth muscles
What is the trochlear CN (IV) classified as?
somatic motor
What muscle does the trochlear CN supply?
superior oblique
What is the smallest cranial nerve?
the trochlear CN (IV)
What is the apparent origin of CN IV (trochlear)?
posterior brain stem
How is the Trigeminal CN (V) classifed?
mixed; somatic motor and sensory
What is the nickname for the trigeminal CN (V)?
“Great sensory nerve of the face”; including: orbit, nasal cavity and paranasal sinuses, oral cavity, ear, and internal skull
What is the largest CN?
trigeminal (V) CN
What does the motor supply of CN V (trigeminal) supply?
muscles of mastication
How is CN VI (abducent) classified?
somatic motor
What does the abducent nerve supply?
the lateral rectus
How does the lateral rectus muscle move the eyes?
turns eyes laterally to the side
How is the facial CN (VII) classified?
mixed; motor: somatic and parasympathetic
sensory: somatic and special
What is a nickname for CN VII (Facial)?
nerve of facial expression
What does the facial nerve carry?
taste from the anterior 2/3 of the tongue
What muscles does the facial nerve supply?
muscles of facial expression: stylohyoid and stapedius
What glands are supplied by the facial CN?
lacrimal and salivary glands
How is the vestibulocochlear CN (VIII) classified?
special sensory: hearing and equillibrium
Where does the vestibulocochlear CN get its sensory info from?
cochlea and vestibule (nerves)
How is the glossopharyngeal CN (IX) classified?
mixed
motor: branchiomotor and parasympathetic
sensory: somatic, special, and visceral
What does CN IX (glossopharyngeal) carry?
taste from the posterior 1/3 of tongue
What does the glossopharyngeal CN motor supply?
stylopharyngeus
What is the parasympathetic supply of CN IX (glossopharyngeal) to?
parotid gland
How is CN X (vagus) classified?
mixed
motor: branchiomotor and parasympathetic
sensory: somatic, special, and visceral
What is the longest CN?
vagus (X)
What does the motor supply of the vagus (X) CN to?
pharyngeal constrictors
What is the parasympathetic supply of the Vagus (X) CN?
bronchi, heart, GI tract (esophagus to distal 1/3 of transverse colon)
What is the classification of accessory (spinal accessory) XI CN?
motor
What parts make up CN XI (spinal accessory)?
cranial and spinal parts
What does the spinal accessory (CN XI) supply?
muscles of the larynx, pharynx, and palate (Cranial)
trapezius and sternocleidomastoid muscles (spinal)
How is CN XII (hypoglossal) classified?
motor
What muscles does CN XII (hypoglossal) supply?
intrinsic and extrinsic muscles of the tongue
Where does CN I exit?
cribriform plate of ethmoid bone
Where does CN II exit?
optic canal
Where does CN III exit?
superior orbital fissure
Where does CN IV exit?
superior orbital fissure
Where does CN V1 exit?
superior orbital fissure
Where does CN V2 exit?
foramen rotundum
Where does CN V3 exit?
foramen ovale
Where does CN VI exit?
superior orbital fissure
Where does CN VII exit?
internal acoustic meatus
Where does CN VIII exit?
internal acoustic meatus
Where does CN IX exit?
jugular foramen
Where does CN X exit?
jugular foramen
Where does CN XI exit?
jugular foramen
Where does CN XII exit?
hypoglossal canal
