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Motor syste2 - Motor system organisation and disorders...

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Motor system: organisation and disorders Functional anatomy of descending tracts Reflexes: simple stereotyped motor response to a specific type of stimulus Most basic unit of central nervous system function Stretch (myotatic/tendon) reflex o Initiated by tapping tendon/muscle itself to stretch muscle o Quadriceps stretch reflex: striking of patellar tendon leads to extension of knee Features of the reflex o Reciprocal innervation; Inhibition within the reflex arc Tendon reflexes o Biceps reflex (C5/C6); Triceps reflex (C6/C7); Quadriceps reflex (L3/L4); Achilles tendon reflex (S1/S2) Innervation of muscle proprioceptors Golgi tendon organ (GTO) sits in series with extrafusal muscle fibres, whereas muscle spindles sit in parallel GTO innervated by 1b afferents; Muscle spindle innervated by 1a afferents 1a afferents form primary annulospiral endings, activated by muscle stretch Motor supply to spindles is by gamma-motor neurones Role of gamma-motor neurones o
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