FIGURE 33b - Extrapyramidal Pathways

Intro

Figure 33a:	Fibers from Cerebral Cortex | Upper Level of the Medulla | Lower Level of the Medulla | Spinal Cord
Figure 33b:	Cerebral Hemisphere | Midbrain | Medulla and Cerebellum | Spinal Cord
Figure 33c:	Ventromedial Corticospinal Tract | Ventromedial Cortico-Brainstem-Spinal Tract

Part 1: Image-Mapped Tutorial
Part 2: Matching Self-Test: 33a | 33b | 33c
Part 3: Multiple-Choice Self-Test

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4 - Spinal Cord

The complex circuits formed by the pathways involving the cerebellum and basal ganglia ultimately influence the activity of individual muscle groups via their input to cortical motor control areas. These cortical areas influence the activity of spinal cord motor neurons via descending projections in the dorsolateral and ventromedial pathways as described previously. In addition, the basal ganglia convey important information via the dorsolateral and ventromedial pathways to the red nucleus and reticular formation located within the midbrain and medulla and the vestibular nuclei located within the medulla.