Someone recently bought our

students are currently browsing our notes.

X

Motor Control (Spinal Reflexes) Notes

Medicine Notes > Neurology Notes

This is an extract of our Motor Control (Spinal Reflexes) document, which we sell as part of our Neurology Notes collection written by the top tier of Bristol University students.

The following is a more accessble plain text extract of the PDF sample above, taken from our Neurology Notes. Due to the challenges of extracting text from PDFs, it will have odd formatting:

Lecture 12 Motor Control: Spinal Reflexes

*

*

*

*

Spinal and supra-spinal mechanisms o Spinal cord reflex
? Very rapid, automatic and highly stereotyped response o Supra-spinal motor circuits
? Volitional (deliberate) control over movements Types of spinal reflexes o Monosynaptic reflex
? Simplest reflex
? Aka. Stretch or myotatic reflex
? Mechanism for controlling muscle length
? Prevents overstretching of muscle
? Important in generation of muscle tone
? LOW THRESHOLD
? PROTECTIVE REFLEX o Golgi tendon reflex
? Controls muscle tension
? LOW THRESHOLD
? PROTECTIVE REFLEX o Flexor or withdrawal reflex
? Rapidly removes limb from painful stimulus
? HIGH THRESHOLD o Crossed extensor reflex
? Maintains body equilibrium
? HIGH THRESHOLD All these somatic reflexes have 5 common components

1. SENSORY RECEPTOR
? Responds to stimulus by producing a receptor potential
? Activated
? In periphery in most cases

2. SENSORY NEURON
? Axon conducts impulses from receptor to integrating center
? Relays info into CNS
? Afferent

3. INTEGRATING CENTER
? One or more regions in CNS that relay impulses from sensory to motor neurons
? Different levels of connection complexity depending on the stimulus

4. MOTOR NEURON
? Axon conducts impulses from integrating center to effector

5. EFFECTOR
? Muscle or gland that responds to motor nerve impulse
? Gland= autonomic
? Motor=somatic

* Reflex of muscles that are also involved in voluntary movement Monosynaptic (stretch) reflex o Mechanism

Buy the full version of these notes or essay plans and more in our Neurology Notes.