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Neuro3 Motor System
Neuro3 Motor System III
| Question | Answer |
|---|---|
| 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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