Cerebellum Part 1 Flashcards
The cerebellum and basal ganglia are part of a modulation system that influences the descending motor systems without projecting _______ to the periphery
directly
T/F: cerebellar output is largely crossed
False: uncrossed
List a few functions of the cerebellum
planning movement, maintenance of normal muscle tone and body post, regulation of eye movement
he cerebellum is _____ to the cerebral hemispheres and ______ to the brainstem
inferior;dorsal (posterior)
T/F: Superior – carries mainly outputs from the cerebellum
true
T/F: The intermediate zone is important for planning the motor program for the extremities and the lateral zone is important for control of limb muscles in the arms and legs
False
the vermis influences the _____ motor system
Medial
the Flocculonodular lobe influences the ____
medial longitudinal fasciculus
From top to bottom, list the cerebellar structures: anterior lobe, ______ fissure, posterior lobe _______ fissure
primary fissure:; posterolateral fissure
List the Cerebellar micro-structure: deep nuclei
fastigial, globose, emboliform, dentate
The vermis sends projections to the ____ nucleus
fastigial
The interposed nucleus consists of both the _____ and_____
(emboliform and globose)
The Molecular cell layer consists of dendrites of the ______ cells
Purkinje
Climbing fibres originate from ? inferior olivary nucleus
inferior olivary nucleus
Mossy fibers climb up and excite ?
granule cells.
T/F: all outputs are carried by axons of Purkinje cells into cerebellar grey matter.
False: white matter
axons of Purkinje cells form excitatory or inhibitory synapses onto deep cerebellar nuclei and vestibular nuclei?
inhibitory
outputs from cerebellum to other regions excitatory or inhibitory synapses
excitatory
cerebellum is supplied by 3 branches of the
vertebral/basilar artery system. List the 3:
- posterior inferior cerebellar artery
• anterior inferior cerebellar artery
• superior cerebellar artery
Cerebellum is important for ______ and _____ of muscle contractions
scaling;timing
Truncal ataxia – occurs with lesions to:
vermis
Dysdiadochokinesia: inability to do ?
rapid alternating movements
Define Dysrhythmia:
abnormal rhythm and timing of movements
What are some features of Truncal ataxia
wide-based, unsteady, “drunk-like” gait, titubation
Inputs to cerebellum originate from: spinal cord via which tract?
spinocerebellar tracts
T/F: Input to (superior and output from (middle, inferior) ) the cerebellum is via the cerebellar peduncles
False
Dorsal spinocerebellar tract carries proprioceptive information about limb movement from:
lower extremities
T/F: Dorsal spinocerebellar tract synapse in nucleus dorsalis of Clark
true
the Dorsal spinocerebellar tract enters the superior or inferior cerebellar peduncle
inferior
Cuneocerebellar tract receives proprioceptive information from?
upper limb and upper thorax
which tract has fibres that synapse in the external cuneate nucleus
Cuneocerebellar tract
