NEUR3101 Lecture Notes - Lecture 20: Thalamus, Cerebellar Vermis, Retina
Comprises ~10% of the total brain by volume but contains more than 50% of the number of
neurons
-
Neurons arranged in a basic circuit that is repeated throughout the cerebellum
-
Perform similar functions
○
Receive signals from different parts of the brain and spinal cord
○
Project to different motor systems
○
Divided into distinct regions which :
-
Overview
Provides precise timing and appropriate patterns of skeletal muscle contraction
-
Involved in programming of ballistic movements
-
Detects discrepancy between intended and actual movement ("motor error")
-
Immediately during the course of movement, or
As a form of motor learning when the correction is stored in memory
These corrections can be made
○
Corrects ongoing movements based on internal & external feedback
-
Cerebellum
Vestibulocerebellum
-
evolutionary oldest division control balance and coordinates head
-
eye
movements
-
Spinocerebellum
-
ongoing control of voluntary movement, posture and locomotion. Vermis
receives somatic sensory input (touch and proprioception)
-
Cerebrocerebellum
-
evolutionary most recent, with the regulation of highly skilled movements,
especially the planning, rehearsal and execution of complex spatial and temporal sequences of
movement (including speech)
-
Functional divisions of the cerebellum
Cerebrocerebellum
-
Spinocerebellum
-
Vestibulocerebellum
-
Cerebellar cortex
Dentate nucleus
-
Interposed nuclei
-
Fastigial nucleus
-
Deep cerebellar nuclei
Superior peduncle
-
Middle peduncle
-
Inferior peduncle
-
Cerebellar peduncles
Receives information regarding plans for movement from structures associated with programming
and execution of movement
-
Receives information about motor performance from sensory feedback
-
Input from proprioceptors is relayed by the dorsal nucleus of Clarke and travels along the
spinocerebellar tract
-
The inferior olive receives input from a wide variety of structures including the cerebral cortex, the
-
Input
Cerebellum and motor control: Learning & disorders
Monday, 11 June 2018 1:59 AM
Lecture 20 Page 1
Document Summary
Comprises ~10% of the total brain by volume but contains more than 50% of the number of neurons. Neurons arranged in a basic circuit that is repeated throughout the cerebellum. Receive signals from different parts of the brain and spinal cord. Provides precise timing and appropriate patterns of skeletal muscle contraction. Detects discrepancy between intended and actual movement ("motor error") Corrects ongoing movements based on internal & external feedback. As a form of motor learning when the correction is stored in memory. Vestibulocerebellum - evolutionary oldest division control balance and coordinates head-eye movements. Spinocerebellum - ongoing control of voluntary movement, posture and locomotion. Vermis receives somatic sensory input (touch and proprioception) Cerebrocerebellum - evolutionary most recent, with the regulation of highly skilled movements, especially the planning, rehearsal and execution of complex spatial and temporal sequences of movement (including speech) Receives information regarding plans for movement from structures associated with programming and execution of movement.
