Term
| superior cerebellar peduncle |
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Definition
brachium conjunctiva
carried outputs from the cerebellum
decussates in the midbraine at the level of the inferior colliculi |
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Term
| middle cerebellar peduncle |
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Definition
brachium pontis
carries inputs to the cerebellum from the pons |
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Term
| inferior cerebellar peduncle |
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Definition
restiform body ("ropelike body")
carries inputs to the cerebellum from the medulla |
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Term
| function and motor pathways influenced by the lateral hemisphere of the cerebellum |
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Definition
Function = motor planning for extremities
MP influenced = lateral corticospinal tract |
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Term
| function and motor pathways influenced by the intermediate hemisphere of the cerebellum |
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Definition
function = distal limb coordination (fingers and toes)
MP influenced = lateral corticospinal tract, rubrospinal tract |
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Term
| function and motor pathways influenced by the vermis |
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Definition
function = proximal limb and trunk coordination
MP influenced = anterior corticospinal tract, reticulospinal tract, vestibulospinal tract, and tectospinal tract |
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Term
| function and motor pathways influenced by the flocculonodular lobe |
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Definition
function = balance and vestbulo-ocular reflexes
MP influenced = medial longitudinal fasiculus |
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Term
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Definition
dentate
emoliform and globose (interposed nuclei)
fastigial |
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Term
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Definition
largest and deepest cerebellar nuclei
receive projections from the lateral cerebellar hemispheres
active before movement |
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Term
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Definition
emboliform and globose nuclei
receive input from the intermediate part of the cerbellar hemispheres
active during and in relation to movement |
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Term
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Definition
| receive input from the vermis and a small input from the flocculonodular lobe which then project to the vestibular nuclei |
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Term
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Definition
ascend through the cerebellar white matter
form excitatory synapses on the dendrites of granular cells |
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Term
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Definition
receive excitatory inputs from the mossy cells
send axons into the molecular layer that form parallel fibers = runs parallel to the perkinje cells and excites them |
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Term
| All output from the cerebellar cortex is carried through which axons |
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Definition
| axons of the purkinje cells |
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Term
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Definition
| form inhibitory synapses onto the deep cerebellar nuclei and vestibular nuclei |
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Term
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Definition
arise from the contralateral inferior olivary nucleus
wrap around the cell body and proximal dendritic tree of purkinje cells = form excitatory synapses and have a strong modulatory affect on Purkinje cells |
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Term
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Definition
located in molecular layer
excited by synaptic inputs from the granule cell parallel fibers
travel perpendicular to the parallel fibers to cause lateral inhibition (strong, inhibitory basketlike connections) |
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Term
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Definition
in the molecular cell layer
are excited by synaptic inputs from the granule cell parallel fibers
run perpendicular to the parallel fibers
terminate on purkinje cell dendrites and cause lateral inhibition |
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Term
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Definition
granular cell layer
receive excitatory inputs from granule cell parallel fibers in molecular layer
provide feeback inhibition onto the granular cell dendrites |
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Term
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Definition
visible small clearings among the granule cells
contain axons and dentrites encapsulated in a glial sheath
contain large mossy fiber axon terminals and golgi cell axon terminals (both inputs) and forms synapses with granule cell dendrites (outputs) |
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Term
| cerebellar excitatory connections |
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Definition
all axons projecting upward are excitatory:
mossy fibers, climbing fibers, and granule cell parallel fibers)
**output of the deep cerebellar nuclei (not part of the cerebellar cortex) |
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Term
| cerebellar inhibitory connections |
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Definition
all axons projecting downwards are inhibitory:
Purkinje cells, stellate cells, basket cells and Golgi cells |
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Term
| Where do cerebellar output pathways decussate? |
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Definition
1. superior peduncle
2. with the corticospinal (pyramidal decussation) and rubrospinal (ventral tegmental decussation) tracts |
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Term
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Definition
| all are carried by the Purkinje cells to the deep cerebellar nuclei or vestibular nuclei |
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Term
| lesions of the lateral cerebellum will affect which movements |
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Definition
| movements of the distal limb |
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Term
| lesions of the medial cerebellum will affect which movements? |
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Definition
| trunk control, posture, and gait |
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