NROC64H3 Lecture Notes - Lecture 8: Globus Pallidus, Pliers, Spinal Cord
17 Mar 2012
School
Department
Course
Professor
Document Summary
The brain influences activity of the sc voluntary movements. Hierarchy of controls: highest level: strategy, middle level: tactics, lowest level: execution. Sensorimotor system: sensory information used by motor system. Axons descend along 2 major pathways: lateral pathway (distal muscles, esp. flexors): voluntary movements under cortical control. Components: corticospinal tract = pyramidal tract, rubrospinal tract. Effects of lateral pathway lesions: experimental lesions make impaired fractionate movements of arms and hands: ventromedial pathway: posture and locomotion (proximal and axial muscles) under brain stem control. Vestibulospinal tracts - vestibular nuclei in medulla, head (stabilize eyes), legs (posture), Tectospinal tract sc, head for gaze movements. Peripheral lesions: alpha motor neurons (paresis, paralysis, atrophy) lack of muscle coordination etc. Central lesions: spinal shock phase (hypotonia, hemiplegia), hypertonia, hyperrfelxia, babinski. Opposite of the lesions babinski: sole and babies and stretching out. The plannign of movement by the cerebral cortex. Motor cortex: area 4 and 6 of frontal lobe. Area 6 = higher motor area (penfield)
