NROC64H3 Chapter Notes - Chapter 14: Dementia, Deep Cerebellar Nuclei, Hypokinesia
Document Summary
Strategy: association areas of neocortex, basal ganglia. Sensory info generates mental image of body and its relationship to the environment. Tactical decisions based on memory of sensory info from past movements. Sensory feedback used to maintain posture, muscle length, and tension. Descending spinal tracts: lateral pathways: involved in voluntary movement of the distal musculature and are under direct cortical control, ventromedial pathways: involved in the control of posture and locomotion and are under brain stem control. Lateral pathway: corticospinal tract: from neocortex 2/3 from motor cortex 1/3 more somatosensory areas; longest and one of the largest cns tracts. Function of this tract has been taken over by corticospinal tract in humans: the effect of lateral pathway lesions. Corticospinal tract only: movement deficit that can reappear after several months (corticorubrospinal pathway can compensate) Keep head balanced on shoulders as body moves. Vestibular nuclei (medulla) -> bilaterally to cervical spinal unit that control neck and back muscles.
