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Somatic Motor NeuronsSomatic Motor Neurons

upper motor neurons project from the

brain to the spinal cord

lower motor neurons (LMNs) projectfrom the spinal cord to the target

muscle

these two neurons make up the direct

motor pathways

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Innervation to Skeletal MusclesInnervation to Skeletal Muscles

alpha motor

neurons innervate

extrafusal muscle

fibres (main muscle)

gamma motor

neurons innervate

intrafusal muscle

fibres (musclespindle)

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General Reflex ArcGeneral Reflex Arc

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Stretch / Deep Tendon ReflexStretch / Deep Tendon Reflex

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Flexor / Withdrawl ReflexFlexor / Withdrawl Reflex

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Crossed Extensor ReflexCrossed Extensor Reflex

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Tendon ReflexTendon Reflex