Flashcards in 4.1 Cranial Nerves Deck (52)
What is the name of CN I?
What is the function of the Olfactory nerve?
Provide a sense of smell
Where does CN I originate?
Olfactory mucosa --> cribriform plate --> olfactory bulb
What is anosmia?
Lack of smell
What can cause anosmia?
What is the name of CN II?
Describe the pathway of CNII
Retina --> Optic tract --> Optic canal --> Primary visual cortex
What is the name of CN III?
Where does CN III originate?
Describe the pathway of CN III?
Superior orbital fissure and splits into superior and inferior oculomotor nerve.
What is the function of the optic nerve?
What is the function of CN III?
Movement of 4/6 of the extraocular eye muscles and levator palpebrae superioris
How will a CN III nerve palsy present?
Down and out pupil
Enlarged pupil (mydriasis)
What is the name of CN IV?
What is the function of the trochlear nerve?
Moves eye down and in
Describe the pathway of CN IV
Trochlear nucleus --> cavernous sinus --> eye muscles
How may an infection on CN IV present?
Difficulty walking down the stairs
Why is CN IV susceptible to infections?
Longest and runs through cavernous sinus
What is the name of CN V?
Where does the Trigeminal nerve originate?
Trigeminal sensory nucleus complex in the Pons
Name the 3 branches of CN V
What is the function of the trigeminal nerve?
General sensation to the face and innervation of the muscles of mastication
What is trigeminal neuralgia?
Overactive sensory portion of CN V causes burning pain
What is the name of CN VI?
Where does the abducens nerve originate?
Abducens nuclei in the pons
What is the function of the abducens nerve?
Lateral eye movements
What is the name of CN VII?
Name the motor branches of the facial nerve
What do the sensory fibres of the facial nerve innervate?
Taste receptors of anterior 2/3rds of the tongue