💢 فسيو العصبي 11، motor 1
#Physiology_of_CNS 11
#CNS
Motor System
👆👆باذن الله هل انتم مستعدووون😄💪؟ ويلااااا بناااا نبدا🏃🏃🏃
*⃣Motor System:
## راح نشرح عن الجهاااااز المسؤوول عن الحركة وكل م يخص ذاك الجهاز باذن الله💪💪.
🛑Motor Unit:
##👆وتتكون وحدة الحركة من ال 👇
👆single motoneuron and the muscle fibers that it innervates.
🔵✔️The motoneuron pool:👇 is the group of motoneurons that innervates fibers within the same muscle 👌
📌Remember that:👇
🔸fine control 👉Has a single motoneuron innervates only a few muscle fibers .(eg:muscles of the eye )👌
🔸Larger Movement👉Has a single motoneuron may innervate thousands of
muscle fibers . (eg:postural muscle s)👌
🔸The force of muscle contraction is graded by recruitment of additional motor units 👌
🔸The size principle states that as additional motor units are recruited, more motoneurons are involved and more tension is generated👌
## وباق اخر نقطة وراح نختم بهااااا المنشور باذن الله 👇👇👇
## الفرق بين ال👇👇
Small and Large motoneurons.
*⃣Small motoneurons👇
■ innervate a few muscle fibers.👌
■ have the lowest thresholds and, therefore, fire first.👌
■ generate the smallest forc e.
*⃣Large motoneurons👇
■ innervate many muscle fibers. 👌
■ have the highest thresholds and, therefore, fire last. 👌
■ generate the largest force.
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