Lecture_16 - Motor Systems II Descending Pathways between...

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Motor Systems II Descending Pathways between Cortex and spinal cord (fig 14.2) -Lateral and ventromedial (2 groups) -All pass through white matter of spinal cord I . Lateral Pathways ... fig 14.3 -Appendage movement -direct connection from motor cortex to muscle motor neuron - Corticospinal : controls directed movements (appendages) -Decussates at medulary pyramids -Damage to the corticospinal = limit in fine motor control - Rubrospinal : indirect pathway from motor cortex -Starts at the red nucleus (easy to remember rubro = red) of midbrain and immediately decussates -damage to the rubrospinal = trouble moving muscle groups (specific) end up moving large groups only II. Ventromedial Pathways -posture and balance -correlates visual input and motor - Vestibulospinal : short- vestibular nucleus of medulla to spinal cord (bilateral) -neck and back muscle groups -keeps head balanced over body, using inner ear - Tectospinal : originates in superior colliculus through vestibular nucleus to spinal cord -major job is to see or hear stimulus -tectospinal tract turns you to orient to the stimulus while maintaining balance of head and body to keep eye oriented -Pontine and medullary Reticulospinal (fig 14.5) - start in different places: pontine reticular formation and medullary reticullary formation - maintain balance : muscles holding you up against gravity are either contracted or relaxed -Pontine -keeps muscles TENSE when you hold yourself up or lift up
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Lecture_16 - Motor Systems II Descending Pathways between...

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