Somatic Sensory Cortex Flashcards
بسم الله الرحمن الرحيم وبه نستعين
“فبما نقضهم ميثاقهم لعناهم وجعلنا قلوبهم قاسية”
Define Somatic sensory cortex ?
It is the part of Cerebral cortex responsible for smoatic sensory Functions
احساسات الجسد
Site of Somatosensory cortex ?
behind Central sulcus above Lateral Sulcus
In Post Central Gyrus in Parietal Lobe
Mention divisions and areas of Somatosensory cortex
S1: 3.2.1
s2:40
Sensory association area : 5-7 stero
Primary sensory cortex site ?
Post Central area 3-1-2
S1 Body representation?
Locality+ Spatial Orientation
Spatial orientation in s1 is crossed mean ?
The s1 in right cerebral hemishpere responsible for sensation of left body sensations and vice versa
Spatial Orientation in S1 is Inverted Mean ?
The sensation of Face are localized down in the s1 then the trunk then lower limb as you go up
Spatial Orientaion is changable ?
Mean cortical plasticity i.e the ability of the intact senory areas to take the place of the damadged sensory area making the intact one more sensitive
مهم جدااااااا
S1 spatial Orientaion or body represntation is Dispropotinate to actual size of the body areas
but ?
the More sensitive the area is the more size it occupies in S1
it is propotinate to ?
-Number of sensory Receptors
-Sensory Acuity
Body represenation spatial Orientaion or locality chracteristics mention /
C2ID يا سيد مينفعش كده ياسيد فين ازازة الببسي يا سيد @@ طحالب
Crossed
Changable
Inverted
Disproptrionate
Finger and Lips has Large sensory area at S1 why?
That is becasue they have a lot of receptors
and havd high sensory acuity
1-Anterior Columns of S1 Recive?
2-More posterior column receive?
3-More posterior ones ?
4-Most posterior ?
1-Impulses from propricoceptors of Muscles, tendons, joints
2-From slowly adapting Receptors as Ruffini end Organ
3-Deep pressure sensations
4-sensations of movments across skin and touch
Describe Laminar represntation of S1 ?
High degree Of Localization .
is divided into vertical Cloumns
Functions of Primary Sensory Cortex
Mention Function Of S1
What is the imp of S1 ?
Dorsal column sensation + 2
TV PROPR DS
Fine touch
Vibration
Proprioception
Deep pressure
Sterognosis
________________<2
Fast Pain
Fine degrees of Temperature diversity
Effect of Lesion of S1 ? Mention
Loss of sensations felt by S1
TV PROPR DS 2
Fine touch
Proprioception
Vibration
Deep pressure
Sterognosis
Fast pain
Fine degrees of temperature
If person lost Fine localiztion of snsatioan this measn
Lesion to s1
if person cannot detect the orientation of his body parts this means ?
Loss of Propcception and Damage to s1
If person cannto judge critical degrees of pressure
s1 lesion
If person cannto judge critical degrees of weight ?
loss deep pressure sensation + s1 damage
If person cannto judge critical degrees of temperature And SteroGnosis
Lesion to S1