CNS Eye Vision (Witwer) Flashcards
What innervates the superior oblique
CN IV
What innervates the lateral rectus
CN VI
What NS stimulates production of tears?
PSNS
What are the contents of the cavernous sinus?
Oculomotor - CN3 Trochlear - CN4 Ophthalmic - CN V1 Maxillary - CN V2 Carotid artery Abducens - CN6 Trochlear
CN II is the ____ nerve, which is the sensory innervation of ____
- optic
- vision
Pituitary tumors can compress the optic nerve and cause ____
bitemporal hemianopia
CN III is the ____ nerve, which serves as the motor innervation to which EOMs?
- Oculomotor
- SR, MR, IR, IO, and levator palpebrae superioris
The constrictor muscle of the pupil is the ____, which is part of the ____ NS.
Sphincter pupillae
PSNS
Ciliary muscles contract –> Zonular fibers relax –> Lens becomes ____.
This process is known as ____
- rounder
- accommodation
What is the near reaction response?
- Eyes converge
- Pupils constrict
- Accomodation
____ structurally stiffens the eyelid and has 2 muscles attached, the ____ and ____.
- Tarsus
- Levator palpebrae superioris
- superior tarsal muscle
____ is the paralysis of the ciliary muscles, causing loss of ____
- Cyclopleia
- accomodation
____ causes compression and paralysis of CN ____, causing pupils to be fixed and dilated.
Uncal herniation
CN 3 - oculomotor
____ Syndrome occurs when the superior cerval ganglion of the SNS is damaged.
Horner’s Syndrome
What 3 things happen in Horner’s Syndrome?
- Ptsosis
- Anhidrosis
- Miosis
Superior oblique muscles is innervated by CN ____ which is the ____ nerve
CN IV
Trochlear
The superior oblique muscle is needed for what 2 main things?
Reading and walking downstairs
In vertical diplopia, the eye deviates ____. To compensate, the head is tilted to ____, causing a “pathetic look”
- medially
- tilted to normal side
Trigeminal Nerve (CN V) has what 3 divisions?
- ophthalmic (V1)
- maxillary (V2)
- mandibular (V3)
The corneal (blink) reflex involves the afferent limb of the ____ nerve and is carried out by the efferent limb of the ____ nerve
- Ophthalmic - CN V1
- Facial - CN7
In a blow out fracture, what muscle can be trapped?
- Inferior rectus
CN VI is the ____ nerve, which innervates the ____ muscle
- Abducens
- Lateral rectus
The cornea’s refractive power is ____, and the lens’ refractive power is ____. Focal length of the eyeball is 17mm, requiring ____ diopters to bend light to focus on the retina
- 40 diopters
- 20 diopters
- 59 diopters
____ glands secrete a lipid substance that prevents evaporation of tears
Meibomian glands
________ is a sudden loss of vision and is considered an emergency
Amaurosis fugax
The sclera is continuous with the ____, which is why when there is increased ICP, ________ can occur
- dura
- papilledema
____ is a cancer that starts in the retina, with the common presentation of ____
abnormal light reflex
