cranial nerves (first 6) Flashcards
where does the olfactory nerve start, pass through and end
starts at olfactory epithelium passes through the cribriform plate of ethmoid bone and olfactory bulb and terminates in primary olfactory cortex
what type of fibres does the olfactory nerve have
sensory - smell
what are the assessment considerations for the olfactory nerve
nasal fractures, nasothmoidal fractures and using smelling salts
where does the optic nerve start, pass through and end
starts at the retina of the eye, passes through the optic canals, converges at optic chiasm, thalamus where they synapse and then optic radiation runs to visual cortex
what type of fibres does the optic nerve have
sensory - vision
what are the assessment considerations for the optic nerve
visual focus - how many fingers in front of face and in peripheal vision
what type of impulses does the optic nerve carry
afferent impulses for vision
where does the oculomotor nerve start, pass through and end
starts at ventral midbrain through the superior orbital fissure to the extrinsic eye muscles
how is the oculomotor nerve controlled
parasympathetically
what type of fibres does the oculomotor nerve have
motor
what does the oculomotor nerve control / function
raises eyelid
directs eyeball
constricts iris
controls lens
what are the assessment considerations for the oculomotor nerve
if the eye moves up, down and medially
if the pupils change when exposed to light
which muscle does the oculomotor nerve control
cilary muscle that changes the pupil size
where does the trochlear nerve start, pass through and end
starts at the dorsal midbrain and enters the orbits via the superior orbital fissures
what type of fibres does the trochlear nerve have
motor - directs eyeball
what muscle does the trochlear nerve innervate
superior oblique muscles
what are the assessment considerations for the trochlear nerve
if the eyeball moves laterally and downward rotation
what are the three divisions of the trigeminal nerve
v1 ophthalamic
v2 maxillary
v3 mandibular
where does the trigeminal nerve start, pass through and end
starts at the PONS passes through the superior orbital fissure (v1) foramen rotundum (v2) foramen ovale (v3)
what type of fibres does the trigeminal nerve have
sensory v1/2
motor v3
what are the assessment considerations for the trigeminal nerve
check the zygomatic arch, mandible and frontal bones.
see if the jaw can move side to side, clench and open wide
blood in roof of mouth
v1 if they can frown
where does the abducents nerve start, pass through and end
starts at the inferior PONS and enters the orbits via the superior orbital fissure
what type of fibres does the abducents nerve have
motor
what muscle does the abducent nerve innervate
lateral rectus muscle
what does the abducent nerve do
abducts the eye
what are the assessment considerations for the abducents nerve
if the eye abducts
Exit foramen of olfactory nerve
Cribriform plate
Exit foramen of optic nerve
Optic canal
Exit foramen of oculomotor nerve
Superior orbital fissure
Exit foramen of trochlear nerve
Superior orbital fissure
Exit foramen of trigeminal nerve
Superior orbital fissure
Foramen rotundum
Foramen ovale
Exit foramen of abducens nerve
Superior orbital fissure
