NETTER - Neuroscience Flash Cards

Visual Pathways in the Parietal
and Temporal Lobes
1. Spatial visual pathway
2. Middle temporal area
3. Parietal lobe
4. Association visual cortex V3
5. Association visual cortex V2
6. Occipital lobe
7. Primary visual cortex V1
8. V4 visual cortex
9. Object recognition pathway
10. Temporal lobe
Comment: Neurons in the primary visual cortex (V1, Area 17) send
axons to association visual cortices (V2 and V3, Areas 18 and 19);
Areas 18 and 19 also receive inputs from the superior colliculus via
the pulvinar. V1, V2, and V3 project to the middle temporal area
(MTA) and V4. The MTA neurons are direction selective and motion
responsive and further project into the parietal lobe for spatial visual
processing related to motion and positional relationships among
objects in the visual field. V4 neurons are involved in shape and color
perception and project to further temporal lobe structures to provide
high-resolution object recognition, including faces, animate and
inanimate objects, and the classification and orientation of objects.
Small vascular infarcts in the temporal lobe may produce specific
agnosias such as an inability to recognize specific types of objects
(faces, animate objects) or their orientation.
Systemic Neuroscience See book 14.30