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The co-degeneration of limbic projections along with motor projections may result in many of the psychiatric symptoms of these primarily motor illnesses. [9] In OCD, the loop may be dysfunctional, with an imbalance between the indirect and direct pathways resulting in unwanted thoughts, getting "stuck". [3]
The direct pathway, sometimes known as the direct pathway of movement, is a neural pathway within the central nervous system (CNS) through the basal ganglia which facilitates the initiation and execution of voluntary movement. [1] It works in conjunction with the indirect pathway.
The indirect pathway is responsible for the termination of movement. The indirect pathway inhibits unwanted movements by simultaneous increase in excitatory input to other GPi and SNr neurons. [4] Similar to the direct pathway, the indirect pathway is regulated by striatal dopamine. D 2 dopamine receptors inhibit transmission via the indirect ...
The indirect pathway, sometimes known as the indirect pathway of movement, is a neuronal circuit through the basal ganglia and several associated nuclei within the central nervous system (CNS) which helps to prevent unwanted muscle contractions from competing with voluntary movements. [1] It operates in conjunction with the direct pathway.
The balance of direct/indirect activity in movement is supported by evidence from neurodegenerative disorders, including Parkinson's disease (PD), which is characterized by loss of dopamine neurons projecting to the striatum, hypoactivity in direct pathway and hyperactivity in indirect pathway neurons, along with motor dysfunction. [21]
As this pathway only contains one synapse (from the striatum to the internal globus pallidus), it is known as the direct pathway. [ 4 ] The direct pathway is modulated by stimulation of the GPi by the external globus pallidus and subthalamic nucleus , via the indirect pathway .
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