PSYB65H3 Chapter Notes - Chapter 3-4: Retina, Odd Future
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PSYB65 Sensory and Motor Systems and Disorders:
Chapters 5 & 6
•Motor system resides in the frontal cortex
•Visual system: Everything begins with the Retina. The retina, is part of the
CNS, and is part of the brain;
•The Retina is divided right down the middle; in each half of the retina, the
portion that is closest to the nose is referred to as the nasal portion; the part
closest to the outside of the head is referred to as the temporal portion of the
retina. Information from each of these halves forms a specific kind of
connections. What goes on the temporal portion of the retina is very different
from the activity that goes on in the nasal portion of the retina.
•Area 17 – Primary receptive area for the visual cortex. Slide #1
•Tract – pathway inside the CNS (pathway going into the brain, and spinal
•Nerve – pathway inside the PNS (pathway going to the fingers)
•Tract and Nerve distinguish whether it’s inside the CNS or outside in the
•Everything closest to the eye is called as the optic nerve (even though it is in
the CNS).- for simplicity sake.
•The crossover point of the nerves (X) is called as the optic chiasm, and as it
moves back towards the brain it is called the optic tract.
•the outside portion of the retina, the temporal portion (distal) of the retina:
As the information goes towards the brain, and when the fibers come together
at the optic chiasm, and then the fibers move on outside to the same side of
•The portion that comes from the nasal portion of the eye – those fibers will
•Information from the center of the retina – the part closest to the nose that
info crosses to the other side of the brain. The part of the retina, that falls on
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