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Motor system, SMA + Premotor = Plan of action - Coggle Diagram
Motor system
Cortical motor integration
Spplementary motor area
:
Conception and initiation of mvt
Lesion cause deficits in voluntary mvt or speech
Programming complex sequences of movements
Coordinating bilateral movements
Lesion:
Alien limb syndrome
Premotor cortex
:
Planning and anticipation of a specific motor act
Motor coordination
Lesion cause impairments in gait and hand coordination
Activate the medial region when involve memory
Lesion:
Loss of short-term or working memory
When SMA + premotor damage =
APRAXIA
Prefrontal cortex
:
Selection of actions for particular behavioral context
Lesion:
Problem in executive processing
Innapropriate behavioral reactions
Can't anticipate their actions
Impulsive behavior
Parietal cortex
Integration between motor and sensory
Ability to produce well-learned acts
Proprioceptive and kinesthetic information
Lesion: APRAXIA (ability to perform skills)
Primary motor cortex
Conscious control of precise skilled, voluntary mvt
Precentral gyrus in the frontal lobe
Conscious control of precise skilled, voluntary mvt
Pyramidal cells = release glutamate
Lesion :
Contralateral weakness
Ability to control fine mvt gone
Motor cortex plasticity:
Flexible by acquisition of motor skills
Neuronal reorganization
Lesion and pathology of the motor system
UMNL
Paralysis and weakness
LMNL
Damage to alpha motor neurons
= interrupt the control of CNS on the muscles contraction
Pain
Muscle weakness
Atrophy / Hypertrophy
Fasciculation
Fibrillation
Hypotonia
Hyporeflexia or areflexia
Diseases of the motor system
SMA + Premotor = Plan of action