Psy 123_Lec 10 Action

Pmc and sma are two key areas of the prefrontal

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Unformatted text preview: s of the prefrontal cortex, are involved in motor planning. The M1 runs along the pre-central gyrus and is for initiating voluntary movement. From M1 goes to spinal cord to carry out that final movement. Feedback is very important in all of this; includes S1 (runs along postcentral gyrus) codes for touch sensations and body sensations. Also will have feedback from the cerebellum which will encode for posture and body postioning. The basal ganglia and cerebellum together provide very important modulations of these motor functions. The basal ganglia is a major player. Overview of Motor Pathways and Structures! Hierarchical organization with 3 levels of control over the musculoskeleton – spinal cord, brainstem and cerebral cortex. ! The spinal cord includes the final common pathway for all motor control and interneurons that integrate sensory feedback from muscles and joints with descending commands from higher centers. ! The brain stem, including regions such as the reticular formation (RF) and vestibular nuclei (VN), selects and enhances the spinal repertoire by improving postural control and locomotion. ! The cerebral cortex supports a large and adaptable motor repertoire involved in goal-directed reaching movements. ! Motor planning and visual feedback are provided through several parietal and premotor regions, including the premotor cortex (PMC) and the supplementary motor area (SMA). ! The primary motor cortex (M1) contributes the largest number of axons to the corticospinal tract and receives input from other cortical regions involved in motor planning. ! Somatosensory information is provided through the primary somatosensory cortex (S1), parietal cortex area 5, and cerebellar pathways. ! The basal ganglia (BG) and cerebellum (C) provide important modulations of motor function through their connections with M1 and other brain regions. ! Scott (2004) Nature Reviews Neuroscience! Overview of Motor Pathways and Structures! 24:00 Another view: Can think of these movement as two stages. First stage is the planning of the movement, select goal and plan that out. Done by association cortex like the parietal lobe and the PFC, and its going to take the SMA and PMC to plan out specific muscle actions, and will need BG and C to modulation - when to keep movement going, when to stop it. The signals then get sent to M1 and the descending signals carry out (execute) that movement) Disorders of Motor Pathways and Structures! hemiplegia! A neurol...
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