Neuro Flashcards
Oculomotor nerve 3
Motor to several extraocular mm
Trochlear nerve 4
Motor to superior oblique m
Trigeminal nerve 5
sensory to eyelids, cornea, lacrimal gland
Abducens nerve 6
motor to lateral rectus m and retractor bulbim
Facial nerve 7
motor to eyelids
vestibulocohlear nerve 8
vestibular component of ochlear nmovements
Afferent
Sensory
Efferent
Motor
visual sensory system (CN 2)
Sympathetic and parasympathetic
autonomic nervous system
Pupillary light reflex (PLR)
Pupillary constriction with bright light
Afferent: CN2
Efferent: CN3
Dazzle reflex test
Bright light in front of eye= eye close
Afferent: CN 2
Efferent: CN 7
What is the autonomic nervous system
balance between para/sympathetic innervations of iris= pupil size
Miosis
small pupil
Mydriasis
large pupil
Anisocoria
unequal pupil size
What are some characteristics of PRL’s
subcortical response
Does not test vision
Help localize a lesion
Both pupils should constrict when a bright light goes in one
What does sympathetic innervation do to the eye
Pupil dilation
Optic nerve 2
Sensory from retina to cortex
What is the Schirmer Tear Test
assessment of the basal and reflex tear production
1st order neurons
T1-T3
Diencephalic autonomic centers
2nd order neurons
Preganglionic
leave spinal chord by T1-T3 roots
Join vago-sympathetic trunk and cranial cervical ganglion
Horners syndrome
Sympathetic nerve paralysis
What does the occulomotor system consist \of
CN3(oculomotor n): Dorsal, ventral, medial, rectus muscles, inferior oblique
CN4(trochlear): superior oblique
CN6(abducens): lateral rectus, retractor bulbi
Strabismus
Lack of parallelism of the visual axes of the eyes
Nystagmus
Rhythmical oscillation of the eyeballs
Physiologic Nystagmus
To keep the visual target steady during head movements
Pathologic nystagmus
vestibular disease
lesion of CN 8
What nerves are used in the palpebral reflex
Afferent: CN 5
Efferent: CN 7
What are the two main branches of trigeminal
Opthalmic
Maxillary
What are the branches of opthalmic branch of CN 5
Supraorbital N: upper eyelid, forehead
Nasocilliary n: medial canthus, 3rd eyelid
Long and short ciliary: ciliary body, iris, cornia
What are the nerves involved in corneal blink reflex
Afferent: CN 5
Efferent: 6&7
