💢 فسيو العصبي 3
#physiology_of_CNS
🔷➰بسم الله الرحمن الرحيم➰🔷
*⃣Somatosensory system :
## هذا السستم يشمل احساسنااااا باللمس والحركة والحرارة واخيرااا الالم🙈👌😍 .
🔷Pathways in the somatosensory system :👇👇
📌A:Dorsal column system :👇
## هذا ال dorsal column مسؤول عن حمل او نقل ال Fine Sensation مثل ال 👇👇👇
🔷👆fine touch, pressure, two-point discrimination, vibration, and proprioception 👌
■ consists primarily of group II fibers 👌👌
🔷Pathway:👇👇👇
##primary afferent neurons have cell bodies in the dorsal roo t.
🛑Their axons ascend ipsilaterally to the nucleus gracilis and nucleus cuneatus of the medulla 👌👌👌
🛑From the medulla, the second-order neurons cross the midline and ascend to the contralateral thalamus, where they synapse on third-order neurons 👌👌👌
🛑Third-order neurons
ascend to the somatosensory cortex, where they synapse on fourth-order neurons👌👌
📌B:Anterolateral system :👇
## هذا النوع مسؤول عن احساسناااا بال 👇👇👇
🔷👆Temperature, pain, and light touch 👌😎
🔹consists primarily of group III and IV fibers, which enter the spinal cord and terminate in the dorsal horn👌👌
🔷Pathway:👇👇👇
🛑second-order neurons cross the midline to the anterolateral quadrant of the spinal cord and ascend to the contralateral thalamus, where they synapse on third order neurons 👌👌
🛑Third-order neurons ascend to the somatosensory cortex, where they synapse on fourth-order neurons 👌
#⃣ 👆👆ف كل ال Pathway او المسارات اللفوق ، لازم نفهم ونكون عارفين مين هو ال Firt order neuron ومين هو الل Second ومين هو ال Third order neuron وكمان م ننسى ال
🔸Synapse👌
👆واخيرا ي حلوين م ننسى ع اي Tract راح يصل الالم مثلاااا لل Cortex وهل ال Tract مسارها Ipsilateral او Contralateral 👌 وهيك😉👌 فهمتو علي ثح ي حلوين😄💪 وراح نواصل ف المنشور اللقادم باذن الله.
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