Neuromuscular Considerations Flashcards
1
Q
Autogenic Inhibition
A
- GTOs override muscle spindles to allow muscle to relax when under stretch
- muscle stretch held at least 6 seconds allows GTO inhibitory signal to cause muscle relaxation
2
Q
Reciprocal Inhibition
A
- contraction of agonist causes relaxation of antagonist allowing it to stretch
- i.e. contract QUAD to stretch HS and vice versa
- motor neurons of agonist receive excitatory afferents
- motor neurons to antagonist receive inhibitory afferents
3
Q
Golgi Mazzoni Corpuscles
A
Group II Joint Afferent
- stimulated by joint compression & rotation
- weight bearing
4
Q
Pacinian Corpuscles
A
Group II Joint Afferent
- measure joint motion
- within joint capsule
- stimulated by accellerations
5
Q
Ruffini Endings
A
Group II Joint Afferent
- measure joint motion
- within joint capsule
- stimulated by extreme movement
6
Q
Group II Joint Afferents
A
Large, fast, myelinated
- Ruffini endings
- Pacinian corpuscles
- Golgi Mazzoni Corpuscles
7
Q
Group III & IV Joint Afferents
A
Small, slow, thin, and non-myelinated
- A & C fibers
- Free nerve endings
8
Q
Cutaneous Afferents
A
FAST ADAPTING: detect & report sudden changes in speed & movement
SLOW ADAPTING I & II: report position/info (joint & limb)
* increased reliance following injury
9
Q
Muscle Spindle
A
Detect muscle stretch —> contraction to get out of stretch
- sensitive to stretch and the rate of change in muscle’s length
10
Q
Golgi Tendon Organs
A
- detect muscle tension —> antagonist relaxation
- located in tendon @ MT junction
- not as sensitive to stretch as muscle spindles, but very sensitive to muscle contraction
- perform autogenic inhibition of muscle when stimulated
