Basal Ganglia Flashcards
4 parts of BG
Striatum
Globus Pallidus
Subthalamic Nucleus
Substantia Nigra
Lentiform nucleus refers to:
Putamen and globus pallidus
3 circuits in BG
Oculomotor
Motor
Limbic
Oculomotor circuit originates ____ and projects to ____
Frontal and supplementary motor eye fields –> Caudate
Function of oculomotor circuit
Saccadic Eye Movements
Motor loop pathway
Precentral motor and postcenral somatosensory areas –> Excites putamen –> inhibits globus pallidus –> activates vental lateral nucleus and supplemental motor area
Function of Motor Loop
Boosts activity in ventral lateral nucleus and supplmental motor area
Scale amplitude and velocity of movements
Reinforces selected patterns/suppresses conflicting patterns to prepare for movement
Limbic Circuit Pathway
Prefrontal and limbic areas of cortex –> BG & Prefrontal cortex
Function of limbic circuit
Organize behaviors (executive function) Procedural learning