Funcal regions of cerebellum PT 2

ipsilat ataxia

cerebellar lesion causes ___

unsteady gait (truncal ataxia) and eye movement abnorms

lesion to middle cerebellum causes ___

appendicular ataxia

lesion lat to vermis of cerebellum (lat and intermediate hemispheres) causes ___

double-crossed, ipsilat

cerebellar output pathways (to lat motor systems and periphery) are ___ so coordination deficits occur ___

interposed nucleus; sup cerebellar peduncle; pyramidal decussation (corticospinal) and ventral tegmental decussation (rubrospinal)

outputs from intermediate cerebellar hemisphere via ___

1st crossing: ___

2nd crossing: ___ and ___ (2 major cerebellar motor output pathways)

vermis

lesion of ___ doesn’t cause unilat deficits bc medial motor systems influences the prox trunk ms bilatly

interposed nuclei, cross at sup cerebellar peduncle, motor cortex, cross at pyramidal decussation (medulla)

cerebellum to lat corticospinal tract path

interposed nucleus, cross at sup cerebellar peduncle, red nucleus, quick cross at ventral tegmental decussation

cerebellum to rubrospinal tract path

red nucleus

where rubrospinal tract begins

pontocerebellar and spinocerebellar tracts

2 major cerebellar input pathways

vestibular, visual, auditory, somatosensory

input to cerebellum comes from all areas of cerebellar cortex (all sensory modalities so ___)

pontocerebellar fibers via corticopontine fibers

input mostly from primary sensory and motor cortex and part of visual cortex (any senses relayed from pons to cerebellum)

dorsal/ventral/rostral spinocerebellar, cuneocerebellar tract

4 spinocerebellar pathways (input)

dorsal spinocerebellar (LE) and cuneocerebellar (UE) tracts

input pathways for unconscious proprioception of limb movements (“unconscious” bc info ends at cerebellum and not cerebral cortex)

ventral (LE) and rostral (UE) spinocerebellar tracts

input pathways that reflect the amount of activity in descending pathways; relays info about activity of interneurons w/in SC

dorsal spinocerebellar tract

proprioception info from LEs; never crosses (ipsilat)

cuneocerebellar tract

proprioception info from UEs; never crosses (ipsilat)

SC, nucleus dorsalisof clark (synapse), DSCT, thru inf cerebellar peduncle, ipsilat cerebellum

pathway of dorsal spinocerebellar tract

SC, fasciculus cuneatus, synapse at external cuneatus nucleus (medulla), CCT, thru inf cerebellar peduncle, ipsilat cerebellum

pathway of cuneocerebellar tract

decussate at interneurons, V/RSCT, sup cerebellar peduncle

pathway of ventral (LE) and rostral (UE) spinocerebellar tracts

SCA, AICA

branches off basilar A

PICA

branches off vertebral A

sup cerebellum

SCA supplies

ant/inf cerebellum; cerebellar peduncles

AICA supplies

post/inf cerebellum; lat medulla

PICA supplies