ORGANISATION OF MOTOR SYSTEM

NEURAL CONTROL OF MOVEMENT

Movement is crucial to all organisms. its performed in higher animals by contraction of & relaxation of the muscles.

Motor system exists in Brain to translate out thought, sensation, emotion & feeling into MOVEMENT.

SENSORY SYSTEM –> transforms physical energy into neural signals

MOTOR SYSTEM –> NEURAL signal is converted to contractile force of muscle and hence converted into MOVEMENT.

SENSORY REPRESENTATION FORM FRAMEWORK IN WHICH –

  1. motor system plans, coordinates & executes.
  2. motor system programmes a purposeful movement
  3. it a highly complicated & integrated system.
  4. ability of human beings to carry out skilled movement while still performing cognitive tasks requires flexibility, integration & skills that no other organism /animal has.

TYPES OF MOVEMENT

ORGANISATION OF MOTOR SYSTEM

  1. IDEA – Posterior Parietal cortex, Association areas
  2. PLANNING – Premotor , Supplementary motor Cortex, Thalamus, Basal Ganglia
  3. PROGRAMMING – Cortex, Basal Ganglia
  4. MOTOR COMMAND – Cortex – {Spinal cord, brain stem } –> via descending tracts
  5. EXECUTION – Spinal cord –> via –> Final common path
  6. ACTION –> contraction of muscle, joint movement
  7. COMPARISON, COORDINATION –> Cerebellum, Thalamus, Sensory pathway

All voluntary activity involves activity of CEREBRAL CORTEX.

ROLE OF DIFFERENT PARTS OF BRAIN IN MOTOR CONTROL :

  1. CORTICAL MOTOR AREA
    • Highest level of motor control
    • 3 criteria :
      • stimulation using low current strength elicits movements
      • destruction of area results in loss of motor function
      • area has output connection directly(or with minimal or intermediate connections) to brainstem or spinal cord.
    • 2 groups : Primary motor Cortex & Secondary motor cortex.
  2. POST PARIETAL CORTEX
  3. FRONTAL EYE FIELD
  4. BROCA’S AREA
  5. SUPPRESSOR AREAS (4s, 2s, 8s, 19s & 24s)

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