Dorsal column sensations Flashcards
يسم الله الرحمن الرحيم وبه نستعين
Dorsasl cloumn sensation
Lemiscal system path
TV PROPR DS
Fine touch
Vibration
Propriception Kinesthetic
Deep Pressure
Sterognosis
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
Dorsal Column Tract called ?
1-Gracillar Cuneate Pathway
2- Lemiscal system
Dorsasl cloumn receptros are
(MechanoReceptors)
? dorsal clumn tract 2nd order neuron :
Sensory deucssation in medulla to (VPLN)
Dorsal Column Tract Type of Sensation ?
-All cortical+ sharply localized +Epicritic sensations
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
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
Receptors of Fine touch ?
Mechanoreceptors
MMR Pacinain
Meissiner +Mekels+ Ruffini +Pacinian
Displacemnt +deofrmity
Types of Fine touch ?
Tactile Localization + Tactile disrcination
دول نوعين من اللمس الخفيف دي تطبق عليها كل قواعد الفاين تتش
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
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
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
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
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
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