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
“ولو شاء لهداكم أجمعين “
TYPE OF AFFERENTS TO muscle psindle
Primary afferent
2ry afferents
Primary affrerents to muscle spindle describe ?
TS4
Type : fibers Ia A alpha 16u
Speed: Rapid
Shape : AnnuloSpiral
Site : Center of Nuclear Bag +Nuclear Chain muscle fibers
State of respones: Dynamic +static
2ry afferents to muscle spindles describe
TS4
Type: II fibers 8u
Speed: slowly conducting
Shape : Flower Spray
Site : Nclear Chian only
State of Respones :Static only Tonic
Both 1ry and 2ry afferent of muscle spindle enter spinal cord then ?
Synapses directly with the a motor neurons to extrafusal muscle fibers
Some afferents through spinoCerebellar Tract enter the Cerebellum for unconscious proprioception
Some enter the Cerebral cortx for Conscious proprioception
Some afferents through spinoCerebellar Tract enter the Cerebellum for 1?
Some enter the Cerebral cortx for 2?
1-unconscious proprioception
2- Conscious proprioception
How to Excite Muscle spindle ?
1-Lenghtening of Whole Muscle
2-Contraction of peripheral parts of intrafusal Muscle Fibers
3-Maximal Stimulation Occurs in case of 2 stimuli occurs at same time
Comparison between Dynamic and static SR
TRESADRC
Defintion
receptor
afferent
center
Stimuluts
Time basis
response
Efferents
Comparison between Dynamic and static SR in def\
Dynamic Stretch Reflex :
It is reflex sudden tetanic maximal contraction due to sudden stretch
Static SR: Reflex Maintatined Muscle contration due to Maintatined Stretch
Comparison between Dynamic and static SR about stimulus
Dynamic sudden steTch
Static Maintained stretch
Comparison between Dynamic and static SR about receptor ?
Dynamic: central of Nuclear bag + Nuclear Chain
Static : Central of Nuclear Chain
Comparison between Dynamic and static SR afferents
Dynamic Ia Aa primary afferents
Static Ia +II PRIMARY +SECONDARY
Comparison between Dynamic and static SR in center
both ?
AHC IN SPINAL CORD
Comparison between Dynamic and static SR IN EFFERENT ?
BOTH
Aa motor Neuron
Comparison between Dynamic and static SR IN RESPONSE
Dynamic : Sudden contraction followed by Rapid relaxation
Static : Contiuous Maintatined Contraction
Comparison between Dynamic and static SR in Time
Dynamic :Within second
Static : Maintained +Prolonged
Comparison between Dynamic and static SR and apllied example of which it is the basis ….
Dynamic : Tendon Jerk
Static : Muscle tone
SR doesn’t have Interneurons this leads to ?
1- Fastest reflex
2- No reucritment+ No After Discharge
SR inhibited by?
inhibited i.e ?
يعني مفيش عليها تحفيز مش معناها خربانه
مفيش تحفيز + متثبطة
1-Active Muscle Contractio
2- Inverse Steretch reflex by gogli tendon organ
3- Strech reflex of the antagonist muscle
Mention properities of SR ?
DSMO NORIS
-Deep + Spinal
-Monosynaptic so fastest
-No Interunurons so fastest no recritment no afterdischarge
-Reciprocal innervations stimualtion of stretch reflex of muscle casuing its contraction and inhibition of anatgonistic one
-Inhibited by : active cont + inverse SR + SR of antagonist
-Semiquantitative : increased+decreased + LOST
“قل نزله روح القدس من ربك بالحق ليثبت الذين آمنوا وهدي وبشري للمسلمين “
الحمدلله رب العالمين
