Pratique - AI questions on APAs and CRSP system Flashcards
What are the main components of the Cortico-reticulo-spinal-pontine (CRSP) system?
The main components are:
- Cortical Areas (M1, PMC, SMA, ACC)
- Reticular Formation (pontine and medullary)
- Spinal Pathways (reticulospinal and vestibulospinal tracts)
- Medial pathways
What are the key cortical areas involved in the CRSP system and their roles?
Key cortical areas include:
-Primary Motor Cortex (M1): Primary movement execution
- Premotor Cortex (PMC): Movement planning and APA initiation
- Supplementary Motor Area (SMA): Movement sequencing and APA generation
- Anterior Cingulate Cortex (ACC): Motor control and attention
What is the role of the reticular formation in the CRSP system?
The reticular formation:
- Integrates posture and movement signals
- Coordinates APAs
- Processes information between cortical and spinal levels
- Modulates muscle tone and postural control
Define Anticipatory Postural Adjustments (APAs) and their timing.
APAs are:
- Automatic postural responses
- Occur 50-100ms before primary movement
- Prepare body for upcoming perturbation
- Maintain postural stability during movement
What are the main functions of APAs?
Main functions include:
- Maintaining postural stability
- Counteracting upcoming forces
- Optimizing movement efficiency
- Protecting against balance loss
- Preparing body for voluntary movement
How do APAs contribute to movement initiation?
APAs contribute by:
- Pre-activating postural muscles
- Shifting weight appropriately
- Establishing dynamic stability
- Creating optimal conditions for movement
- Minimizing perturbation effects
How does the CRSP system generate APAs?
The process involves:
- SMA and PMC initiate APA signals
- Signals travel through reticular formation
- Activation of appropriate postural muscles
- Coordination of timing with primary movement
Explain the relationship between CRSP and movement coordination.
CRSP coordinates:
- Simultaneous activation of postural and movement systems
- Integration of feedforward and feedback mechanisms
- Timing of APAs with primary movement
- Muscle activation sequences
What are common pathological presentations in CRSP system dysfunction?
Common presentations include:
- Delayed APA onset
- Reduced APA amplitude
- Poor coordination
- Inappropriate timing
- Instability during movement initiation
How does Parkinson’s Disease affect the CRSP system and APAs?
Parkinson’s Disease effects include:
- Reduced APA amplitude
- Delayed APA onset
- Poor weight shifting
- Increased postural instability
- Difficulty initiating movement
What are key assessment components for CRSP system function?
Assessment should include:
- APA timing analysis
- Movement initiation quality
- Postural control assessment
- Balance strategies evaluation
- Muscle activation patterns
