Week 10: Motor Systems Flashcards
What are the principles of motor systems?
There is a hierarchical and parallel organisation
Sensory input guides output
Nature and locus of control change with learning
-when you go from conscious to automatic
True or false
The structure is very different to that of the sensory system
False
It is very similar, just flows in the opposite direction
Actions are performed by…?
Muscles
Muscles act under…?
Tension
Alpha motor neurons + muscles fibres = ?
motor unit
How do alpha motor neurons and muscle fibres communicate?
neuromuscular junctions
How is muscle activity measured?
Electromyography
What is a golgi tendon organ?
A receptor embedded in the tendons which connects muscle to the bone
Detects muscle tension
What are muscle spindles?
A receptor embedded in muscle tissue which detects changes in muscle length
What is the stretch reflex?
a monosynaptic reflex that serves to maintain limb stability
What is a withdrawal reflex?
a reflex that is not monosynaptic and is much more complex.
What are the 2 subcortical structures of the motor system?
Basal Ganglia and the Cerebellum
What is the role of the basal ganglia?
When you become more efficient with movement, “proper” BG controls is
The proper BG consists of the caudate nucleus and putamen forming the striatum
What is the role of the cerebellum?
The cerebellum consists of 3 parts:
Neo - motor planning
Spino - motor execution
Vestibulo - balance and eye movement
What are the cortical structures of the motor system?
Primary Motor Cortex
Secondary - planning of movement
Association - posterior parietal cortex involes in proprioception
