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Neuro3 Motor System

Neuro3 Motor System III

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Major Cortical areas controlling motor function. 1.Primary Area (Primary Motor Cortex): High fidelity representation, segregation of modalities). 2.Secondary Area (Secondary Motor Cortex): combining the high fidelity muscle groups into complex patterns.
2 main regions of the Secondary Motor Cortex 1.Premotor Cortex (controlled by the cerebellum). 2.Supplementary Motor Cortex (controlled by the Basal ganglia).
Describe the neuronal arrangement of adjacent Somatic areas of the Primary Motor cortex Neurons will OVERLAP but will not be identical. **Overlap due to usually related functions (Ex: fingers & wrist)
How do we generate specific joint movement? Integration of Primary and Secondary motor cortex: Cement patterns of neuronal activation only when they produce desired action/movement. **Cemented in the Basal Ganglia & Cerebellum
If you mentally reherse a movement, what gets activated? Supplimentary Motor Cortex. Useful to enhance the preformance in sports.
The Motor cortex successfully carries out movements via: ? 1.Somatic organization. 2.Muscle representation (overlapping produces coordinated movements). 3.Output Coding (groups of neurons). 4.Integration of motor cortex areas (Primary & secondary).
What is created around the boundaries of the Middle Cerebral Artery? C-shaped WATERSHED zone of anastomoses with Ant and Post cerebral A.
Describe what will affect the watershed zone It is the area of LOWEST pressure, thus changes in perfussion pressure will greatly affect BF here and thus the tissues it supplies. **affected by vessel quality, BP changes, HF, shock.
Where in the motor cortex does the Watershed zone cross? TORSO region.
Is watershed infarct damage to the Motor cortex very damaging to an adult? baby? NO. YES: causes a PARASAGITTAL injury which will affect their ability to crawl or walk well (will walk up on toes, sprawl out when crawling).
Is a Parasagittal injury from a watershed infarct a stable or evolving lesion? STABLE. **at birth the motor cortex is developed so damage will be permanent.
What is another name for a watershed infarct? Cerebral Palsy
Why will you get a Periventricular Leukomalacia from a watershed infarct instead of a parasagittal injury if the baby is born Preterm (26-34 weeks)? B/c their water shed zone is not as well defined/developed and is broader & more medial . Much more problems with lower extremity. **watershed zone will move with further natal development.
Created by: WeeG
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