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Flashcards in cerebral cortex Deck (33)
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1

Every cubic inch of cerebral cortex has about ____ miles of nerve fibers

10,000

2

The number of neurons in the brain is about ___ times greater than the number of humans on the planet

30

3

Typically a neuron is wired to about how many of its neighbors?

1000-2000

4

What is the advantage we have by being good at storing and processing sensory information?

We are better in effective responses to our environment

5

Most cortical neurons are a site of _____ input from multiple neurons

Converging

6

Most cortical neurons are a source of _____ output to multiple neurons

Diverging

7

What is Layer 1 of the cerebral cortex?

Molecular layer; mostly axons

8

What is Layer 2 of the cerebral cortex?

External granule layer

9

What is layer 2 made up of?

Granule (stellate) cells

10

What is the 3rd layer of the cerebral cortex?

External pyramidal layer

11

What is Layer 3 made up of?

Primary pyramidal cells

12

What is layer 4 of the cerebral cortex?

Internal granule layer; main granular cell layer

13

Most incoming sensory signals terminate in which layer of the cerebral cortex?

Layer 4

14

What is layer 5 of the cerebral cortex?

Internal pyramidal layer

15

Layer 5 is dominated by what?

Giant pyramidal cells

16

What is layer 6 of the cerebral cortex?

Multiform layer

17

What types of cells are found in layer 6?

All types; pyramidal, stellate, fusiform

18

Name the 3 major types of cells in the cerebral cortex?

Pyramidal
Granule
Fusiform

19

Which type of cell is a major efferent cell?

Pyramidal

20

____ cells are the least common of the three

Fusiform

21

Which cells give rise to output fibers from cortex?

Fusiform

22

Which cells are a source of cortiospinal projections?

Pyramidal

23

Granule cells have ___ axons

Short

24

Excitatory neurons release what?

1° glutamate

25

What do inhibitory neurons release?

1° GABA

26

Short axons of granule cells function as what?

Interneurons (intra cortical processing)

27

Most output leave the cortex via which layer(s)?

5 and 6

28

Spinal cord tracts originate from layer __

5

29

____ connections are from layer 6

Thalamic

30

Most intracortical association functions are in layer(s) ____

1,2,3