chapter 12: corpus striatum

Question 1

corpus striatum

Answer 1

= substantial region of gray matter near the base of each cerebral hemisphere

Question 2

corpus striatum consists of

Answer 2

striatum= caudate nucleus + putamen

lentiform nucleus= putamen + globus pallidus

Question 3

basal ganglia of telencephalon =

Answer 3

= corpus striatum + claustrum + amygdaloid body

Question 4

structures of the lentiform nucleus

Answer 4

• globus pallidus with external and internal parts separated by lamina of white matter
• putamen is separated from globus pallidus externa by lamina of white matter
• claustrum is separated from putamen by external capsule
• insula is separated from claustrum by extreme capsule
• medial surface lies against internal capsule

Question 5

structures of caudate nucleus

Answer 5

head

tail that ends in amygdaloid body

Question 6

connections of the striatum (afferents)

Answer 6

• from cerebral cortex: corticostriate fibers (+)
• from thalamus: thalamostriate fibers (+)
• from substantia nigra: nigrostriate fibers (+ & -)

Question 7

connections of the striatum (efferents)

Answer 7

• striatopallidal fibers (-)

- striatonigral fibers (-)

Question 8

connections of the pallidum

Answer 8

• receives GABA- ergic inhibitory input from striatum

- efferents: pallidofugal fibers

Question 9

functions of the corpus striatum

Answer 9

those related to movement

• no movement: neurons striatum at rest and neurons of pallidum active
• before & during movement: neurons striatum active & neurons pallidum at rest