Dorsal column sensations Flashcards by Omar Gazar

يسم الله الرحمن الرحيم وبه نستعين

Dorsasl cloumn sensation

Lemiscal system path
TV PROPR DS
Fine touch
Vibration
Propriception Kinesthetic
Deep Pressure
Sterognosis

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TV PROPR DS
Fine touch
Vibration
Propriception Kinesthetic
Deep Pressure
Sterognosis Are Common in

-all (MechanoReceptors) imp !
-First order neuron impulse from receptor to the dorsal column tract white matter not Dorsal Horn
and All afferents are A Beta thick and Myleinated ending at Medulla synapsing with( gracile of L.L)
(Cunate of U.L ) Called gracillar cunate pathway
-2nd order neuron : Sensory deucssation in medulla to (VPLN)
-3rd oredr neuron in posterior limb of
internal Capsule and Corona radiata to Sensory Cortex
-all cortical sharply localized Epicritic sensations

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Dorsal Column Tract called ?

1-Gracillar Cuneate Pathway
2- Lemiscal system

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Dorsasl cloumn receptros are

(MechanoReceptors)

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? dorsal clumn tract 2nd order neuron :

Sensory deucssation in medulla to (VPLN)

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Dorsal Column Tract Type of Sensation ?

-All cortical+ sharply localized +Epicritic sensations

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اي احساس هنناقشه هنتكلم في ايه

1-التعريفdef :
2-receptors name type mech
mechano - D2 deformity or diplacement

3-afferents ABETA
4-pathway Dorsal Column Lemincsal gracillar cuenate path

5-perception area cortex epicritic

6-Adaptaions
7-test

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Fine touch

-the ability of body to detect contact with objects accurately
-receptors
Mechanoreceptors
MMR Pacinain
Meissiner +Mekels+ Ruffini +Pacinian
Displacemnt +deofrmity
-Afferents A beta
-pathway : dorsal Column
-perception : Dorsal Column
-adapation : Rapidly Adapted Phasic
Types of Fine touch ?
Tactile Localization + Tactile disrcination

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Receptors of Fine touch ?

Mechanoreceptors
MMR Pacinain
Meissiner +Mekels+ Ruffini +Pacinian
Displacemnt +deofrmity

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Types of Fine touch ?

Tactile Localization + Tactile disrcination
دول نوعين من اللمس الخفيف دي تطبق عليها كل قواعد الفاين تتش

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Tactile Localization Tocuh Mean and Test ?

It Means the ability of closed eye person to localize the point of sensation touch on his body
Test: 2 Marker Test

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Tactile discrimination mean ?

It is the ability of a person with closed eye to to disrciminate tocuh at separate 2 points at the same time

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Tactile discrimination mean ?+ test?

It is the ability of a person with closed eye to to disrciminate tocuh at separate 2 points at the same time
Weber Compass Test

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Threshold distance عرف؟
مهمة جدا جدا

اقل مسافى تقدر تفرق بيها بين لمس نقطتين في جسمك في نفس الوقت
-The Minimal distance between 2 Points to be felt as 2 separate Points
بتختلف من منطقة لاخري في الجسم
2-3mm in Fingers + Lips
4-6mm in dorsum of hand
5-6 cm in back

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Low Distance Threshold mean ?

1- Alot of receprtos
2-alot of afferents
3- Large Cortical represnatation area
4- Less Convergence of afferent
5-small receptive field
6-High sensory acquity

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Fingers are charcterized by ? in Tactile disrcimation ?

Low distance Threshold so It is Charcatrized by ?
1-MANY RECEPTORS
2-MANY AFFERENTS
3-Largre CORTICAL REPRESENATION
4-Less Convergence of afferents
5-Small receptive field
6-High sensory Acuity

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High thrshold distance area are chracterized by?

Less receptors
less afferent
small cortical represenation area
Wide convergence of afferets
Large receptive field
Low Sensory Acuity

The back is cc by ? in tactile discrination ?

High Threshold Distance
less receptors
less afferents
small cortical represntation area
Wide convergence of Afferents
Large receptive fields
Low sensory acuity

Vibration means ?

Ryhtmic repetitive Pressure sensation
حاسس بهزة حاجة بتروح وتيجي
when tunning fork is put on bony prominences

Receptors of Vibration are ?

Touch and pressure receptors are inovolved in vibration sensation
Pacinan 30-800 cycle/s
Messiner 2-80 cycle /s more sensitive
كانوا موجودين في fine touch
Types Mechanoreceptors
Mech: Deformity + Displacement of Receptors

Vibration is …..sensation ?

Mixed one = Touch + Pressure

وما محمد إلا رسول قد خلت من قبله الرسل أفإن مات أو قتل انقلبتم علي أعقابكم ؟

ومن ينقلب علي عقبيه فلن يضر الله شيئا
الشاكريـــــــــــــــــ(وسيجزي الله )ــــــــــــــــــــن

هذا الوقت سيمضي ؟

فاتق الله وكن مع المفلحين

كثرة موت الفجأة بين الشباب يا حسرة علي العباد !

هل لو كنت مكانهم كنت مستعد للقاء الله ؟
أفلا تبصر قبل ان تقول رب ارجعون ؟؟؟؟؟؟
فيقال لك كلا؟

Vibration inf !

Afferents a beta pathway dorsal column perception : EpiCritic adaptaiton of receptors : Phasic vibration indeed is not constant stimulus so no adapation occur Test : Tunning Fork test

Vibration can be adapted ?

It is not constant stimulus so no adapation occurs althoug is is classifeid rapidly adapting due to its phasic receptors

ليه بتاثر علي العظم

for magnification of stimuli as in Obese

Kinesthetic or prorioception mean ?

The conscous sensation of Body Position + Movements at its parts

Types of proprioception ?

Static proprioception for Position Dynamic Proprioceptin for Movments

عرفلي propicoception?

هو الاحساس الواعي بموضع وحركة اجزاء الجسم منه ؟ static and dynamic:- Static : هو قدرة شخص مغمض عينيه علي الاحساس بموضعه وموضع اجزاء جسمه بالنسبة بعضها لبعض وبالنسبة للفراغ Dynamic: قدرة شخص مغمض عنيه انه يحس بحركة اجزاء جسده بالنسبة لبعضها البعض وبالنسبة للفراغ

Propriceptors receptors

سواء ستاتيك او ديناميك يعني وضع او حركة مشتركين في 4 -Ruffinin end organ -stretch receptors: .Muscles spinle .Gogli Tendon Organ -Receptors at joints capsule tendon ligaments بس في مستقبل زيادة مع مين ؟ مع الحركة اسمه ايه مش ورانا غيره ؟ Pacinian corpuscles : for intial rate of movements as it is rapidly adapting Each propriceptors detecet a limited range of movments

سواء ستاتيك او ديناميك يعني وضع او حركة مشتركين في 4 مستقبلات

-Ruffinin end organ -stretch receptors: .Muscles spinle .Gogli Tendon Organ -Receptors at joints capsule tendon ligaments

Type of receptors of Propriceptos ?

Mechanoreceptros

Type of receptors of Propriceptos ?

Mechanoreceptros Deformity+ Displacement afferent A beta Path : Dorsal Column Tract Leminscaul gracillocuneat tract Perception Epicritic+cortical + sharply Localized

adaptation at propricepton ؟

خش بقلب جامد وقوله sloooooooow لانه ال4 المشتركين كلهم بطيئين tonic ماعدا أنت يا pacinan في الحركة بيبقي سريع مرحلي عشان بس الخطوات الأولي من الحركة وبعدين شكرا روح كمل شغلك

UnConsiuous sensation felt in ? tract ? importrane?

In Cerebellum by SpinoCerebellar Tract Imp for Balance and Equilibrium

UnConsiuous sensation felt in ? tract ? importrane?

In Cerebellum by (SpinoCerebellar)Tract... Imp for( Balance) and Equilibrium..

Deep pressure sensation ?

قدرة شخص مغمض عينيه انه يعرف ثقل الاشياء من غير ما يشيلها عشان لو شالها العضلة هتنقبض وهتفهمه بال proprio

receptors of deep pressure sensation ?

-Deep pacinain -Deep Ruffini End organ in skin Fascia And Muscles -They are Mechanoreceptors by deformity and displacement Afferents : A beta Pathway? Dorsal column lemiscal tract Proprecttin : cortex epicritic Sharply Localized Adapation slooooooooooow with ruffinin Test test for deep pressure

adaptation of Deep pressure ?

SloooooOOOOoooooW Due to Ruffinin slow adapting tonic receptors

Sterognosis ? define

قدرة شخص مغمض عنيه انه يعرف حجم وشكل و نسيج الشئ الملموس المألوف to know hte size shape texture of familart something by palpation

List Sterognosis requirements

3 Intacts :- -Intact sensation Touch + Prssure + Proprioception Receptors in skin -muscles -joints . -Intact Sensory Association Area 5-7 for higher cortical Processing -Intact Memory : perviously expericenced object