LIFESCI 3K03 Lecture Notes - Lecture 4: Anatomy Of The Cerebellum, Motor Planning, Cerebellum
10 Apr 2013
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Voluntary movement: whether big or small, require axn of agonist and antagonist muscle, typically happens through descending neuron, tells motoneuron to either act or not act, usually managed by ach system. Motor commands: originates in motor cortex, spinal cord, to muscle, signal from motor cortex to periphery, desccending fibres go from cortex, through brain stem, through spinal cord, before motor neurons. The midbrain: control sensory and motor functions, pursuit tracking, automatic processes that are not reflexes (e. g. learning to ride a bike, midbrain controls vestibuloocular reflex (vor) Cerebellum: most important organ of movement, locus of time, motor learning, posture, voluntary movement is largely cortical, most learned physical activity is cerebellar, the cerebellum builds models of the world (dyslexia and autism) Large descending fibres from motor cortex to periphery. Profound amt of weakness that has set in. Brain is sending a signal to the periphery but it is getting lost along the way.
