6.1 neuro - cerebral cortex

Question 1

what is gray matter

Answer 1

neurons arranged in layers

Question 2

what is white matter

Answer 2

myelinated fiber tracts

Question 3

what are the three types of cortex

Answer 3

neocortex, mesocortex, allocortex

Question 4

what are the 6 layers of neocortex / cerebral cortex

Answer 4

I molecular
II external granular
III external pyramidal
IV internal granular
V internal pyramidal
VI multiform (fusiform)

Question 5

function of layer I molecular of the cerebral cortex

Answer 5

apical dendrites of pyramidal neurons

Question 6

function of layer II external granular of the cerebral cortex

Answer 6

recipient zone of diffuse thalamic projections and other subcortical nuclei

Question 7

function of layer III external pyramidal of the cerebral cortex

Answer 7

cortico-cortical projections

Question 8

function of layer IV internal granular of the cerebral cortex

Answer 8

recipient zone of precise, topographically organized projections from specific thalamic nuclei

Question 9

function of layer V internal pyramidal of the cerebral cortex

Answer 9

principal output layer to subcortical targets

Question 10

function of layer VI multiform (fusiform) of the cerebral cortex

Answer 10

output to thalamus

Question 11

is the cortex the same all over

Answer 11

no!

Question 12

what is the functional unit of the cerebral cortex

Answer 12

cortical column

Question 13

what are the three types of white matter connections within the brain

Answer 13

association, commissural, projection

Question 14

where are projection fibers located

Answer 14

internal capsule

Question 15

where are commissural fibers located

Answer 15

corpus callosum, anterior and posterior commissures

Question 16

are association fibers short or long

Answer 16

some short some long, some named tracts

Question 17

where do association fibers travel

Answer 17

within the hemisphere, gyrus to gyrus, lobe to lobe

Question 18

where to commissural fibers travel

Answer 18

connect each half of the brain to the other half

Question 19

what fiber connects the brain to lower centers

Answer 19

projection fibers in internal capsule

Question 20

what fibers connect the left and right hemispheres

Answer 20

commissural

Question 21

what fibers connect lobes and gyruses

Answer 21

association