Lecture 3 Test 3 Flashcards
What are the 4 spinal reflex pathways?
Stretch reflex
Tendon reflex
Withdrawal reflex
Crossed extensor reflex
Which reflex are for muscle stretch/tension?
Stretch reflex
Tendon reflex
Which reflex are for pain?
Withdrawal reflex
Crossed extensor reflex
Gives feedback to the CNS when muscles are stretched or contraction has occurred and elicit a reflex
Tension sensors
Can sensory fibers go all the way through the dorsal horn and project a synapse to the anterior motor neuron?
Yes if the signal is strong enough
A “bridge” for the sensor neuron and motor neuron.
Interneuron releasing inhibitory transmitter
Most common signal that uses efferent pathway out of the CNS?
Motor output
Reflexes can affect which side of the body?
Sometimes 1 side and sometimes both
How does the L side of the sensor neuron talk to the R side?
Through the Interneuron
Goal of stretch reflex
To keep posture constant for support. Stretch and contraction of muscles helps keep us standing straight
Stretch sensors can go through the cord and synapse to ___
Motor neuron (anterior of the cord)
Do we use interneurons for the stretch reflex?
No
“spring” found within the muscle that sense the tension in the muscle
Muscle spindles
Test for stretch reflex
Hit the patellar tendon/ligament with a rubber mallet
Senses large amount of tension within the tendon/muscles
Tendon reflex
build up of collagen and fibrin tissues
Tendon
What happens when there’s massive tension placed on the muscles/tendon?
Stretch sensors activated and tells muscles to relax to prevent tendon tears.
What doesn’t break when you fall of a tree?
Muscles
What prevents muscles from being pulled out of tendons/muscle insertion points?
Tendon reflex
If tendon reflex are protective, how can someone lift a car off a kid during an emergency??
The body has a way of overriding this but I don’t know how.