Cerebral cortex, behavior & dementia Flashcards
What is the general role of the cerebral cortex?
Analyzes, plans and initiates responses to sensory pathways
What adjusts the level of cortical responsiveness?
The reticular formation and diffuse modulatory system
Describe the morphology of pyramidal cells
Neurons with a long apical dendrite and a basal dendrite. Dendritic spines are formed/modified by learning.
What neurotransmitter is used by pyramidal cells? What about nonpyramidal cells?
Pyramidal: glutamate
Non-pyramidal: GABA
What are the nonpyramidal cells?
Inhibitory neurons with various morphologies, but do not leave the cortex
“Interneurons”
How many layers does the neocortex have?
Neocortex has 6 layers
Which cortical layers contain neurons that project out of the cortex?
Layers V and VI
What are the major connections between hemispheres?
Corpus callosum
Anterior commisure
What are association bundles?
AKA: fasciculi
Connections between regions of the brain on the same side. Not discrete point-to-point connections.
Where is the primary motor cortex?
Precentral gyrus (BA4)
Where is the primary somatosensory cortex?
Postcentral gyrus (BA312)
Where is the primary visual cortex?
Calcarine (BA17)
Where is the primary auditory cortex?
Transverse temporal gyrus (BA41)
What is the result of injury to unimodal association areas?
Agnosia: can see/describe an object but cannot name
What is the result of injury to multimodal association areas?
Apraxia (motor) or neglect (sensory)