Stretch Reflex 21% of Motor Imp Flashcards
بسم الله الرحمن الرحيم وبه نستعين
Names of Stretch Reflex?
1-SR: Stretch reflex
2-MR : Myotatic Reflex
3-MSR Muscle spindle Reflex
4-MMR Muscle to Muscle Reflex
Stretch reflex is ?
Reflex CONTARCTION of muscle in reponse to its STRETCH
اي ريفليكس هنتكلم
عن ؟
سراق العصر؟
SRAC ERA
Stimults
Receptor
Afferent
Center
Efferent
Response
AIM
Stimulus of stretch reflex
Mild or moderate stretch not SEVERS —- Inverese stretch refelx
لما واحد يضربك بوش الكوتشي في وتر اخيل جامد العضلة هترتاح وهتقع علي الارض
ممكن الوتر يتقطع
Receptor of Stretch reflex?
Muscle Spindle Intrafusal Muscle fibers strtech midl and moderate
Afferents of Stretch reflex ?
Type Ia fibers A alpha:primary afferent
Type II fibers A delta
to AHCs: Secondary afferent
The Center of Stretch reflex is ?
AHCs characteritisc in strecth reflex ?
-Monosynaptic
-Fastest
-less delay Central
AHCs characteritisc in strecth reflex ?
-Monosynaptic
-Fastest
-less delay Central
Efferent of Stretch Reflex ?
Aa Type Ia Fibers
Thick Myelinated Fastest
Respone of Strech reflex ?
Muscle contration
Effectort or Strecth Reflex ?
Ordinary Contractile ExtraFusal Muscle Fibers
Aim of Strecth Reflex ?
It is Negative feed back reflex aims to keep length of Contractile muscle constant!!!!!!!!!
CAim of Strecth Reflex ?
It is Negative feed back reflex aims to keep length of Contractile muscle constant
Charactirstics of Mucle stretch Reflex?
MFC LARy
only monosynaptic+Fastet+less central delay
Local to the stretched muscle
Antigravity muscles has alot of muscles spindles so it is appear in it mostly due to gravity effect i strecthing these muscles
RECEIPROCAL INNERVATION:
Contratcion of Stretched Muscle + Inhibition of Antagonistic one
Contraction Of biceps relax triceps
RECEIPROCAL INNERVATION: in stretch reflex explain
Contratcion of Stretched Muscle + Inhibition of Antagonistic one
Contraction Of biceps relax triceps
Type of Muscles spindle and what is it monitorig?
Mechanorecetpros monitoring The muscle lenght
The rate of Change in Musclce Lenth \
اوصف لي muscle spindle
Encapsulated 3-10 IntraFusal Muscle Fibers parallel to extrafusals
Monitoring Muscle Length
The ends of capsule are attached to tendons of Muscles
اوصف لي intrafusal muscle fibers at types
Has to types
=Nuclear bag:
With dilated central part with nuclei collected …1-3 Fibers
=Nuclear Chain :-
Non-Dilated Central Part
With Nuclei 3-9 Muscle Fibers
thinner and shorter than Nuclear bag and are attached to sides of Nuclear Bag.
اوصف لي intrafusal muscle fibers at parts
Central :
Nuclei
Non contractile no actin or myosin
Stretchble receptor
Receptor part
Peripheral:
No Nuceli
Contractile Actin myosin
Non Stretcble i.e not receptor !!
Effector for gamma motor Neurons
Compare Both types of intrafusal muscle fibers
CRSNA
Central part:
Bag: dilated with Nuclei
Chain: non dilated with nuclei
Response:
Bag: Rate of Stretch
Chain: Degress of Stretch
Number :
Bag 1-3 chain 3-9
Adaptation :
Bag : phasic
Chain : Tonic
State :
Bag Dynamic
Chain Static
Why Nuclear bag is dynamic while Nuclear chain is static ?
Nuclear bag dynamic becasue it is phasic and stops discharge in maintained stretch as it is depdnent on rate of Stretch
شغالة طول ما في مؤثر بيروح ويجي فهي كده ديناميك لو راح المؤثر او ثبت خلاص
Chain static as it its tonic never stop discharge impulses in maintained Strech depending on degree of Stretch no the rate
Dynamic large efferent gamma
small static gamma for ?
Dynamic Gamma to peripheral of Nuclear Bag
Static Gamma to Peripheral Of Nuclear Chain
Explain Efferent motor innervation of Muscle spindle
Gamma motor Neuron
Large dynamic to peripheral contractile of Bag
Small Static To peripheral Contractile of Chain
The receptor of Stretch Reflex ?
IS CENTRAL part of Muscle Spindle
