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Motor Function of spinal cord

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Motor Function of spinal cord

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    1. Motor Function of spinal cord Human Reflexes

    3. Reflex Arc -DIF/ - formed of : -Sense organ (receptor). -An afferent neuron. -One or more synapses (CNS). -An efferent neuron. -An effector organ -Bell-Magendi law

    5. Components of reflex arc

    8. Reverberating circuits 1- Parallel 2-Reverbrating

    9. Reverberating circuits

    10. Renshaw cells - located in anterior horn with motor neurons. -inhibitory (presynaptic inhibition, negative feedback fashion) & lateral inhibition to nearby neurons.

    14. Stretch reflex

    16. Stretch Reflex/ example Knee jerk

    17. Stretch reflex receptor ( Muscle Spindle) Structure of Muscle Spindle:- Two types of intrafusal fibres: .

    19. Innervation of the muscle spindle 1-Sensory Afferent fibres: 2-Efferent fibres to spindle

    24. Types of responses Component of stretch reflex 1-Dynamic stretch reflex (dynamic or phasic response) 2- Static stretch reflex( static response

    25. Muscle Tone:- Static stretch reflex Dif/ resistance of muscle to stretch -Stimuli for muscle tone -Present in ? -hypotonic or flacidity -hypertonic,spastic muscle

    26. Effect of gamma efferent discharge:- a- dynamic gamma efferent B-Static gamma efferent

    27. Muscle can contract by:- alpha-gamma linkage(coactivation)

    28. Reciprocal inhibition IN KNEE JERK/ contraction of EXTENSOR of thigh >>>>>>> relaxation of FLEXORS

    30. Physiological Tremor :-.

    31. Higher control on gamma efferent discharge :- 1-Cortical areas. 2-Basal ganglia.

    32. 3-Brain stem. Facilitatory Inhibitory: 4-The cerebellum.

    33. Facilitatory supra spinal centers

    34. Inhibitory supra spinal centers

    35. Factors influence stretch reflex ) Enhances Inhibits

    36. Jendrassiks Maneuver :

    37. The Golgi tendon reflex (inverse stretch reflex- (AUTOGENIC INHIBITION))

    38. The Golgi tendon reflex (inverse stretch reflex)

    40. Lengthening Reaction:- response of spastic muscle to lengthening Clonus:- as Ankle clonus

    41. Clinical significance of stretch reflex:- -Tendon jerks

    42. Centers of some reflexes Clinical significant

    43. Centers of some reflexes Clinical significant

    44. Withdrawal reflex (flexor reflex) -Properties of withdrawal R - crossed extensor reflex

    46. Importance of withdrawal reflex:- Other examples of polysynaptic reflexes

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