netter23
Cerebellum: Efferent Pathways
NEUROPHYSIOLOGY
Inhibitory endings of Purkinjc cells
cerebral
cortex
‘ Interna! capsule
Mesencephalic reticular formatiom
Red nudeus.,
Fastigial nudeus
Clobose nuclei
Cerebral pedunde
Decussation of superior cerebellar pcduncles
Descending fibers from superior cerebellar peduncles
- Hook bundle of Russell
Emboliform nudeus
Dentate nudeus
Cerebellar
Section
A-B
viewed
from
below
Vestibular nudei-
Inferior cerebellar peduncle
Inferior olive Lateral reticular nudeus
Medulla oblongata Pontomedullary reticular formation
Planes of section: red arrows indicate direction
Section
B-C
viewed
from
above
Figurę 2.22 Cerebellar Efferent Pathways_
The cerebellum plays an important role in coordinating movement. It influences descending motor pathways to produce fine, smooth, and coordinated motion. The archicerebellum is primarily involved in controlling posturę and balance and movement of the head and eyes. It sends efferent fibers to the appropriate descending motor pathways. The paleocerebcllum primarily Controls movement of the proximal portions of the limbs. It modifies and coordinates these movements through efferent pathways to the appropriate descending motor pathways. The neocerebellum coordinates the movement of the distal portions of the limbs. It helps in the planning of motor activity (e.g., seeing a pencil and then planning and executing the movement of the arm and hand to pick ił up).
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