Flashcards in cerebral cortex Deck (33)
Every cubic inch of cerebral cortex has about ____ miles of nerve fibers
The number of neurons in the brain is about ___ times greater than the number of humans on the planet
Typically a neuron is wired to about how many of its neighbors?
What is the advantage we have by being good at storing and processing sensory information?
We are better in effective responses to our environment
Most cortical neurons are a site of _____ input from multiple neurons
Most cortical neurons are a source of _____ output to multiple neurons
What is Layer 1 of the cerebral cortex?
Molecular layer; mostly axons
What is Layer 2 of the cerebral cortex?
External granule layer
What is layer 2 made up of?
Granule (stellate) cells
What is the 3rd layer of the cerebral cortex?
External pyramidal layer
What is Layer 3 made up of?
Primary pyramidal cells
What is layer 4 of the cerebral cortex?
Internal granule layer; main granular cell layer
Most incoming sensory signals terminate in which layer of the cerebral cortex?
What is layer 5 of the cerebral cortex?
Internal pyramidal layer
Layer 5 is dominated by what?
Giant pyramidal cells
What is layer 6 of the cerebral cortex?
What types of cells are found in layer 6?
All types; pyramidal, stellate, fusiform
Name the 3 major types of cells in the cerebral cortex?
Which type of cell is a major efferent cell?
____ cells are the least common of the three
Which cells give rise to output fibers from cortex?
Which cells are a source of cortiospinal projections?
Granule cells have ___ axons
Excitatory neurons release what?
What do inhibitory neurons release?
Short axons of granule cells function as what?
Interneurons (intra cortical processing)
Most output leave the cortex via which layer(s)?
5 and 6
Spinal cord tracts originate from layer __
____ connections are from layer 6