💢 فسيو العصبي Motor 6
#Physiology_of_CNS 16
#CNS
*⃣Cerebellum—central control of movement :👇👇👇
##اولا راح نشررررح وظيفة المخيخ تمام👌💪
🔻Functions of the cerebellum:
A.Vestibulocerebellum—control of balance and eye movement.
B.Pontocerebellum—planning and initiation of movement.
C.Spinocerebellum—synergy, which is control of rate, force, range, and direction of movement.
🔺Layers of the cerebellar cortex :👇
## وثانياااا راح نشرح الطبقات تبع المخيخ 💪👇🏃
0⃣Granular layer:👇👇
■ is the innermost layer.
■ contains granule cells, Golgi type II cells, and glomeruli.
■ In the glomeruli, axons of mossy fibers form synaptic connections on dendrites of granular and Golgi type II cells.
1⃣Purkinje cell layer:👇👇
■ is the middle layer.
■ contains Purkinje cells.
■ Output is always inhibitory.
2⃣Molecular layer:👇👇
■ is the outermost layer.
■ contains stellate and basket cells, dendrites of Purkinje and Golgi type II cells, and parallel fibers .
■ The parallel fibers synapse on dendrites of Purkinje cells, basket cells, stellate cells,
and Golgi type II cells.
🔽Connections in the cerebellar cortex :👇👇👇
🛑Input to the cerebellar cortex :
(1) Climbing fibers:👇👇👇
■ originate from a single region of the medulla (inferior olive) .
■ play a role in cerebellar motor learning .
(2) Mossy fibers:👇👇👇
■ originate from many centers in the brain stem and spinal cord .
■ include vestibulocerebellar, spinocerebellar, and pontocerebellar afferents.
🛑Output of the cerebellar cortex :👇
■ Purkinje cells are the only output of the cerebellar cortex.
■ Output of the Purkinje cells is always inhibitory; the neurotransmitter is g-aminobutyric acid (GABA).
🔴Remember That:👇👇👇
#⃣Clinical disorders of the cerebellum—ataxia :👇👇
🔷Ataxia👉Lack or Lose of Coordination👌
🔷dysdiadochokinesia 👉inability to perform rapid alternating move ment👌
🔷Rebound phenomenon 👉is the inability to stop a movement👌
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