White matter Flashcards
Motor system pathway of grabbing a cup of coffee
1) visual info required to locate target
2) Frontal lobe motor areas plan to reach and command the movement
3) Spinal cord carries information to hand
4) Motor neurons carry message to muscles of the hand and forearm
5) Sensory receptors on the fingers sets message to sensory cortex saying that the cup has been grasped
6) Sensory cortex receives the message that the cup has been grasped
7) Basal ganglia judge grasp forces and cerebellum corrects movement errors
8) spinal cord carries sensory info to brain
What does the cortex integrate information and produce movement via
Pyramidal system
What are motor signals carried to brainstem and spinal cord from the cortex called
Upper Motor Neurons (UMNs)
In the brainstem and spinal cord, what do the UMNs synapse with
Lower motor Neurons (LMNs)
Role of the LMNs
leave the central nervous system and bring motor signals to muscles
Role of cerebellum in movement
Synchronises movement to make sure that movement is occurring
flawlessly
Does this by sending information to muscles via brainstem
Role of white matter
Connects areas of the brain so they can communicate
e.g. can connect hemispheres of the brain and also different gyri
What is white matter
Myelinated axons and groups of myelinated axons form white matter tracts
What are the 3 types of white matter tracts
Association fibres
Commisural fibres
Projection fibres
What are Association fibres
Exchange within one hemisphere (ipsilateral)
What are Commissural fibres
Exchange information between hemispheres (Contralateral)
What is projection fibres
Carry information from the cortex to other regions of the brain and spinal cord. UMNs are projection fibres and the pyramidal tracts are important subsets of UMNs that comprise the pyramidal system and produce movement
what is the Uncinate Fasciculus and role
Connects tip of frontal lobe to tip of temporal lobe
-Role in how we process emotions
What is the Cingulum and role
Connects frontal lobe to temporal lobe
-role in how we process emotion
What is the Superior longitudinal fasciculus
Connects frontal lobe to parietal lobe to occipital lobe
