Neurodynamic principles and approaches Flashcards
What are the two primary functions of the nervous system?
Mechanical function: Tension, sliding, compression, viscoelasticity; Physiological function: Circulation, axoplasmic flow, mechanosensitivity.
How does elongation of a nerve affect its diameter and blood supply?
Elongation reduces diameter, increases intraneural pressure, and reduces blood supply.
At what elongation percentages does nerve blood flow reduce or block?
Reduced: 8% elongation; Blocked: 15% elongation.
What is mechanosensitivity in nerves?
The sensitivity of nerves to normal or abnormal mechanical stimuli, often heightened in injured nerves.
What happens if 6% elongation is maintained for 1 hour?
Blood flow is significantly reduced.
What is thixotropy in the nervous system?
The viscosity of axoplasm, affecting axonal transport and potentially impacted by chemical mechanosensitivity.
Why is circulation crucial for the nervous system?
Supports impulse conduction and axoplasmic flow; without proper circulation, nerve function is impaired.
What are the effects of inflammation on nerve function?
Alters nerve function, impacts axoplasmic flow, and contributes to mechanosensitivity.
What are intraneural dysfunctions of the nervous system?
Hematomas, inflammation, hypoxia, oedema, fibrosis, blocked axoplasmic flow, and reduced viscoelasticity.
What are extraneural dysfunctions of the nervous system?
Scarring of interface tissue, oedema, and structural changes (e.g., hypertrophy, osteophytes, fractures).
How does trauma affect axoplasmic flow?
Blocked axoplasmic flow for 2 hours can take 24 hours to 1 week to recover, depending on pressure applied.
What is adverse neural tension?
Abnormal physiological and mechanical responses from nervous system structures during movement/stretch testing.
What are Shacklock’s intervention techniques?
Sliders and tensioners: Reduce neural tension, improve axonal transport, reduce mechanosensitivity, restore elasticity.
What is Butler’s intervention approach?
Involves sensitizing/desensitizing maneuvers and targeted treatment of affected spinal segments.
