Lecture 30: Sosmatic control Flashcards
What are the two voluntary motor pathways?
Corticospinal pathway - pyrimidal tract = excitatory
Non- corticospinal pathway = excitatory & inhibitory
What is the corticospinal pathway used for?
- pathway used for precise voluntary motor movement of hands & feet
What is the non-corticospinal pathway used for?
pathway for automatic voluntary movement
e.g walking, smiling, chewing
A reflex movement does not involve the:
brain - neurons localised within the spinal cord
What is the role of basal ganglia in voluntary movement?
Selects & initiates movement
What is the role of cerebellum in voluntary movement?
- Coordinates movement guided by sensory feedback
- checks planned movement against actual movement to compute corrections
How many neurons do both motor pathways have?
2 neurons which synapse 1x at spinal cord
In both pathways where does the neuron synapse?
- synpases at the spinal cord - in ventral horns
Describe the corticospinal tract pathway?
- neuron travels from primary motor cortex to the medulla where is crosses over
- neuron travels down and synapses in the spinal cord
- neuron exists the spinal cord at appropriate level
Describe the non-corticospinal pathway?
- neuron travels from primary motor cortes to the mid brian where it crosses over
- neuron travels down and synapses in the spinal cord
- neuron exits the spinal cord at appropriate level
Where does the corticospinal pathway cross over?
medulla
Where does the non-corticospinal pathway cross over
midbrain
What are the two non-corticospinal pathways?
Reticulospinal
Rubrospinal
What does the reticulospinal pathway do?
Excites extensors
Inhibits flexors
What does the rubrospinal pathway do?
Excites flexors
Inhibits extensors
