Visual Pathways Flashcards Preview

ANATOMY KAPLAN FOR THE USMLE > Visual Pathways > Flashcards

Flashcards in Visual Pathways Deck (22):
1

Rods and cones synapse with ?

Bipolar cells

2

The optic nerve forms from fibers of the _______ which then enter to the cranial cavity by the _______.

Optic nerve

enter by the optic foramen

3

Vitamin A is neccesary for _________, and deficit causes _______.

Retinal transduccion

Night blindness

4

During situations with more light more neurotransmitter is secreted

TRUE OR FALSE

False

Less neurotransmitter is secreted when light is present.

5

Increases intraocular presion

Painless

progresive Visual loss

 

Open angle Glaucoma

Decreased aqueosus humor reabsorption.

Chronic

6

Narrow Angle Glucoma

Schlemm canala block

increased IOP

Painfull

Acute

 

7

Which nerve carries light sensory information to the pretectal area ?

Craneal nerve II or optic nerve

8

The nucleus in charge of light reflex is ?

Edinger westphal nucleus

9

Edinger westphal nucleus is responsible for ?

  • Light reflex
  • accomodation-convergence reflexes

10

Pupillary sphincter (iris),Ciliary muscle both are under ______ innervation, which use ______ receptors proucing miosis and ______ .

 

 

Parasympathetic innervation

M3 receptors

Accomodation reflex

11

LIGHt in one eye--> CNII--> ______,from there passes to _________ which usign the CN ____ produces pupillary constriccion of ____ eyes.

 

TO the pretectal nucleus

Passes to Edingher westphal mucleus

Both eyes(direct-consensual reflex)

12

Pupils with no response to light

Accomodation-convergence intact

Argyl Robertson

13

Marcus gunn pupils

light in affected eye= pupils do not constrict fully

Light in normal eye=pupils constrict fully

Again affected eye= dilatation

CN II affected (ME)

 

14

Patient in emergency with fixed and dilatated pupils

"Down and out eyes"

Transtentorial herniation

15

Cells for :

Achromatic

Low light

Night vision, motion

RODS

16

The CN II is formed by axons of ?

The ganglion layer of the retina

17

In the temporal lobe course meyers loop which carries

Information of the lower retina

18

A lesion in the optic chiasm produces ?

Bitemporal heteronymus hemianopia

19

HOw we can difference a lesion of the optic tract form a lesion of the visual cortex ?

Both produce homonymus hemianopia

  • Cortex: light reflex is intact, and usually macula is spared (infarct)

20

A pituitary adenoma compress fiber from_______ and starts as: _____

A craneopharyngioma compress fibers from_____ and starts as________

 

Pituitaryadenoma compress fiber from below, starts as superior cudrantanopia

Craneopharyngioma compess fibers from above , starts as inferior quadrantanopia.

21

Lesion that pass the chiasm are characterized by :

  • Biocular
  • Homonymus
  • Contralateral

22