-
What A supplies the LGN?
Thalamogeniculate (off of posterior cerebral)
-
What A supplies the medial optic radiations and the visual cortex?
Calcarine A (off of posterior cerebral)
-
What A supplies the lateral optic radiations and Meyer's loops?
MCA branches
-
What A provides the Optic tract?
Anterior Choroidal (off of IC)
-
What A provides the optic chiasm?
Branches off of anterior communicating branch of ACA
-
What A provides CNII?
Ophthalmic branches (IC)
-
What A supples the retina and and distal CN II?
Central A of the retina (Opthalmic, IC)
-
What A supply photoreceptors?
Choroid (off of ophthalmic, IC)
-
What is Anopia?
Visual field defect
-
What is Hemianopia?
loss of one half of visual field
-
What is Quadrantanopia?
loss of a quadrant of visual field
-
What is Homonymous deficit?
Deficit in visual field in same part of eye for both eyes
-
What is Heteronymous?
Deficit in visual field in different part of eye for both eyes
-
What fibers are ispilateral or contralateral? Temporal (Lateral) or Medial (Nasal)
- Ipsilateral: Temporal (Lateral)
- Contralateral: Nasal (Medial)
-
Of the LGN layers, which are ipsilateral or contralateral?
- Ipsilateral: 2, 3, 5
- Contralateral:1, 4, 6
-
Which cells can react in more than one location? Granule, simple, or complex
Complex
-
Which cells are center-surround cells? Granule, Simple, or Complex
Granule
-
What type of potentials fire in bipolar and ganglion cells?
- Bipolar: graded potentials
- Ganglion: APs
-
What are the four types of center-surround cells?
- 1) Bipolar
- 2) Ganglion
- 3) LGN
- 4) Granular
-
Which cells make up CNII?
Ganglion cells (axons)
-
What is the Stria of Gennari?
Extra band of perpendicular cells in layer 4 of visual cortex. Only found here!!
-
What gyrus does the Macula Densa synapse?
Posterior portion of Cuneus gyrus
-
What opens and closes Na gated channels in photoreceptors?
- Open = cGMP
- Close = 5' cGMP
-
What type of nerve fibers are housed in the Edinger-Westphal nucleus?
Preganglionic parasympathetic
-
Where do the Pregang. Parasym. of EW synapse to become Postgang. Parasym?
Ciliary ganglion
-
What are the three steps in the accomodation reflex for an object moving closer?
- 1) Medial rectus muscle pulls eyes together
- 2) Pupillary sphinctor muscle conistricts pupil
- 3) Ciliary body contracts = relaxed suspensory ligaments = round lens
-
What is Amblyopia?
abnormal visual stimulation during childhood
-
What is strabismus?
Straying of one or both eyes off of focus
-
What are congenital cataracts?
Cloudy lens
-
What is visual agnosia? Where located?
- inability to recognize a viewed object
- Brodmann areas18-19 (dorsal group)
-
What is Prosopagnosia? Where?
- Inability to distinguish one face from another face
- temporal lobe
|
|
