NS15 basal ganglia (Nuclei) and cerebellum Flashcards
how does the cerebral cortex provide info?
Cerebral cortex says what is to be done
which structure has an input on how the action should be carried out in terms of quality and organisation of movement?
basal ganglia and cerebellum
what type of structures are basal ganglia?
grey matter structures
where does the basal ganglia receive and process info from?
cerebral cortex
where does the feedback from basal ganglia reach?
back to C.cortex via thalamus
is there any direct spinal cord connections between basal ganglia and cortex?
no, can only influence movement via cortex
List the components of the basal ganglia
internal capsule putamen Globus pallidus (subthalamic nucleus) caudate nucleus
where would you find the caudate nucleus?
lateral ventricle
describe the connections of the basal ganglia?
listens processes then talks to motor cortex via thalamus
motor cortex –> Basal Ganglia
Basal Ganglia –> thalamus–> motor cortex
what is the first stage of the basic feedback circuit? (from motor cortex?)
putamen receives input from the motor cortex ‘‘talks’’ to globus pallidus
once GP receives info from stage 1, what happens in stage 2?
GP has a braking effect on thalamus (takes brake off)
once the GP has communicated to the thalamus, what happens next? (stage 3)
thalamus has a stimulatory drive on patterns of motor activity to cortex
where does the caudate Nucleus receive input from?
input from frontal cortex - planning organisation thought processes, not motor
how does the outer and inner segment of the GP communicate?
via the subthalamic nucleus
what does the subthalamus normally promote?
brake on thalamus and C.cortex
