Motor Systems- Tracts, UMN & LMN

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Motorneurons

Usually very large & multipolar

Many located in CNS and project axons outside to directly or indirectly control muscle actions

Long axons that travel to an effector organ- a muscle or a gland

They are the final common pathway for getting things done

Classified according to their targets e.g. somatic, visceral or autonomic

Different Types of Motoneurons

- Somatic motoneurons which supply voluntary ('striated') muscle

- Visceral (autonomic) motoneurons which supply involuntary ('smooth') muscle, cardiac muscle and glands

- Special neurosecretory motoneurons in the hypothalamus

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Basic Components

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