ACUTE—MINUTES TO HOURS Ischemic stroke and hemorrhage start abruptly. Both worsen clinically over hours if cerebellar edema develops. Note the “posterior fossa mantra” of acute cerebellar and brainstem injury—headache, nausea,…
Executive function deficits include problems with working memory, as tested with reverse digit span; mental flexibility is tested using tasks of set shifting; and perseveration is demonstrated using bedside tests…
In the cerebral peduncle, prefrontal fibers are most medial, sensorimotor fibers intermediate, and fibers from the parietal, temporal, and occipital lobes are lateral. In the monkey, terminations in the pons…
Eye Movements. Cerebellar lesions produce unsteady ocular fixation in primary position, microsaccadic oscillations, square wave jerks, ocular flutter, ocular bobbing, and opsoclonus. Pursuit eye movements show saccadic intrusions—jerkiness following a…
CEREBELLAR CORTICONUCLEAR PROJECTION Output from the cerebellar cortex to the DCN is derived exclusively from PCs and is inhibitory. The vermis projects to the fastigial nucleus, the intermediate cortex project…
The exception to the PC-DCN projection pattern throughout the cerebellum is the vestibulocerebellar cortex (vermal part of lobule IX [uvula], vermal [nodulus], and hemispheric parts [flocculus] of lobule X), which…
VESTIBULOCEREBELLAR PROJECTIONS There are five peripheral vestibular end organs; the cristae in the three orthogonally oriented semicircular canals detect movement in the sense of angular rotation in the horizontal, pitch,…
Trigeminocerebellar projections from the principal trigeminal sensory nucleus travel in the ICP to the face representation in caudal lobule V and lobule VI; in contrast, cerebellar projections from the mesencephalic…
Knowledge of cerebellar connections with extracerebellar structures is critical to understanding the diverse roles of the cerebellum and the consequences of cerebellar injury. Afferents to cerebellum are conveyed predominantly by…
Climbing fibers (CFs) arise exclusively from the inferior olive. Axons of olivary neurons branch to form 7 to 10 CFs. Each CF provides extensive excitatory synaptic contact with the dendritic…
