Three functional divisions · Vestby| cerebellum Archicerebellum Flocculonodular lobe Spinocerebellum Paleocerebellum Vermis and intermediate zone · Cerebrocerebellar Neocerebellum Lateral zone Flocculonodular lobe
Three functional divisions • Vestibulocerebellum – Archicerebellum – Flocculonodular lobe • Spinocerebellum – Paleocerebellum – Vermis and intermediate zone • Cerebrocerebellum – Neocerebellum – Lateral zone Flocculonodular lobe Intermediate zone VermisLateral zone
Connections and function of cerebellum Vestibulocerebellum Connections Afferents: receive input from vestibular nucle and primary vestibular Efferents: projects to the vestibular nucleus vestibulospinal tract and medial longitudinal fasciculus -> motor neurons of anterior horn Function: involved in eye movements and maintain balance
Connections and function of cerebellum Vestibulocerebellum • Connections – Afferents: receive input from vestibular nuclei and primary vestibular – Efferents: projects to the vestibular nucleus → vestibulospinal tract and medial longitudinal fasciculus → motor neurons of anterior horn • Function: involved in eye movements and maintain balance
前庭神经核 前庭小脑 螺旋神经节 前庭器 前庭脊髓束 内侧纵束 前角运动神经元
Connections and function of cerebellum Spinocerebellum Connnection Afferents: receive somatic sensory information via spinocerebellar tracts
Connections and function of cerebellum Spinocerebellum • Connnection – Afferents: receive somatic sensory information via spinocerebellar tracts
Efferents Vermis projects to the fastigial nucleus vestibular nuclei and reticular formation y vestibulospinal tract and reticulospinal tract motor neurons of anterior horn Intermediate zone projects to the interposed nuclei Contralateral red nucleus>rubrospinal tract-motor neurons of anterior horn ContralateraⅥ- cerebral cortex→ corticospinal tract→ motor neurons of anterior horn Function: play an important role in control of muscle tone and coordination of muscle movement on the same side of the body
– Efferents: • Vermis projects to the fastigial nucleus → vestibular nuclei and reticular formation → vestibulospinal tract and reticulospinal tract → motor neurons of anterior horn • Intermediate zone projects to the interposed nuclei – Contralateral red nucleus → rubrospinal tract →motor neurons of anterior horn – Contralateral VI →cerebral cortex→ coticospinal tract→motor neurons of anterior horn • Function: play an important role in control of muscle tone and coordination of muscle movement on the same side of the body