cerebellum is attached to the? 1. M.O. by inferior cerebellar peduncles(afferents dominate, eff still present). 2 pons via middle cerebellar peduncle(afferents only). 3. midbrain via superior cerebellar peduncle(efferents dominate, afferents present)
connection of the hemispheres of the cerebellum
lobes:flocculonodular. inputs vestibular nucleus. funct: posture, equilibrum, balance
lobes:anterior, vermis, medial posterior. functions:muscle tone, trunk and limb movements
lobes:lateral posterior, imputs cortico-pontocerebellar (middle peduncle) funct:planning and coordination of skilled movement
(corpus medullare) continuous with 6 peduncles. made of afferent projection fibers, efferent projection fibers, commissural fibers (r to L connecting), association fibers within cerebellum.
extensions of white matter toward periphery appear as a branching tree called?
made of fissures, sulci, folia. most common neuron cell types: pukinje, golgi II, granular, basket,stellate. aranged into 3 laminae: 1. outer-molecular layer, 2. middle-purkinje cell body layer, 3.inner-granular layer. 2 types of input: climbing and mossy. purkinje fibers only fibers taking messages away from the cerebellar cortex
climbing fibers(less numerous of the 2) synaps with smooth branches in molecular layer using? originate in the inferior olivary nucleus.
mossy fibers(very numerous) synaps with granular cells, which synapse with spined dendritic braches of purkinje cells. using what transmitter? (spinocerebellar or corticopontocerebellar)
purkinje cell layer
middle cortical lamina. some smooth branches some spined. myelinated purkinje axons are the only efferent fibers from the cerebellar cortex. terminate in deep central cerebellar nuclei some bypass and end in deiters' portiong of vestibular nucleus. INHIBITORY (GABA) only efferent fibers from cerebellum
central cerebellar nuclei
(4 in each hemisphere, so 8 total) 1.dentate-largest and most lateral2.emboliform.3golbose. 4fastigial-most primitive and medial
exits inferior cerebellar peduncles to terminate in the vestibular nucleus and nuclei for cranial nerves III, IV and VI
go to fastigial nuclei
go to dentate nucleus
axons extend out to red nucleus and reticular formations via superior cerebellar peduncles
(and emboliform) axons generally reach red nucleus and thalamus (via superior cerebellar peduncles)