cerebellum Flashcards
function of
- vermis and intermediate cerebellum?
- lateral hemisphere of cerebellum?
- flocculonodular lobe?
- smooth motor execution
- motor planning/coordination
- posture/balance and eye gaze
principle input to the flocculonodular lobe?
vestibular nuclei (VIII)
major INPUT to the cerebellum travels in ____
inferior and middle cerebellar peduncle (ICP and MCP)
major OUTFLOW from the cerebellum travels in ____
SCP
superior cerebellar peduncle
topographical map layout in the cerebellum?
proximal/axial is middle and distal extremities as you move laterally
vermis and intermediate zones get direct afferent info from____
contracting muscles by muscle spindles and golgi tendon organs –> dorsal roots of spinal nerves go up to cerebellum
three layers of cerebellar cortex?
- -molecular layer (outer layer) - has parallel fibers
- -purkinje layer (middle/most important) –> all inputs to cerebellum fire purkinje cells and only purkinje axons leave the cerebellum
- -granule cell layer (innermost) - has golgi cells, granule cells, and glomeruli
what is the only excitatory neuron in the cerebellar cortex?
the granule cell
the only axons that leave cerebellar cortex?
purkinje axons
what is the only excitatory neuron in the cerebellar cortex?
the granule cell
every other neuronal cell types are inhibitory (including purkinje!)
the only axons that leave cerebellar cortex?
purkinje axons
all of the inputs TO the cerebellar cortex are _____
excitatory
two forms of afferents to the cerebellum?
- -mossy fibers - from motor cortex, vestibulocerebellar, spinocerebellar, and contricopontocerebellar systems
- -climbing fibers - come from inferior olivary nucleus (adjusts motor control)
mossy fibers target and function
excitatory terminals on granule cells
use glutamate
climbing fibers target and function
excitatory terminals on purkinje cells
