CAS BI 325 Chapter Notes - Chapter 14: Rubrospinal Tract, Supplementary Motor Area, Corticospinal Tract
2 Jan 2018
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Document Summary
Control of posture and locomotion; under brainstem control: ventromedial pathways: cortical control. Derive from somatosensory areas of the parietal lobe; regulate flow of somatosensory to brain. In monkeys: unable to make fractionated movements in arms/hands. Grasp small objects, but only by using entire hand. Voluntary movements = slower and less accurate. Overtime cortico-rubrospinal tract pathway was able to compensate for loss of corticospinal tract input. Sends axons that innervate distal motor units directly. Parietal lobes: abstract thought, decision making, anticipating consequences of action. -dysfunctional mirror neurons may be responsible for certain features of autism. Motor loop through basal ganglia originates w excitatory connections from the cortex; Indirect pathway through basal ganglia is complex and thought to antagonize motor functions of the direct pathway. Increased inhibition of the thalamus by basal ganglia underlies movement) ** parkinsons. Violent flinging movements of the extremities cell in the population.
