Anatomy Notes Quiz 3 - Anatomy Notes Quiz 3 The Cerebellum...

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Anatomy Notes Quiz 3 The Cerebellum It is the largest component of the hindbrain (back part of the brain) It coordinates motor commands with sensory input and it communicated with the cortex, brainstem, and spinal cord via the peduncles (tubes where fibers transverse, route of pathway) Landmarks: Has 2 main hemispheres which are separated by the vermis Has horizontal grooves on the surface Has 3 lobes on each hemisphere Anterior (superior): - responsible for antigravity muscles - damage causes increased stretch reflex of support musculature Middle (inferior) - responsible for stopping movements, especially in hands - damage causes problems with fine movements - damage causes dysmetria (over or under estimating pointing or movement) Flocculonodular - responsible for orientation of body in space (positioning) - damage causes staggering, ataxia (problems with coordination), motion sickness feeling, drunken looking - ataxic dysarthria affects muscles of speech, slurred drunken sounded speech Made up of 2 layers: molecular layer (outer layer), purkinje layer and granular layer (deep) First two cell layers are inhibitory in function Granular layer is excitatory in function Tracts of the cerebellum - run in the CNS, only CSD important ones Dorsal Spinocerebellar tract : communicates sensation of temperature, and touch from lower body and legs to the same side cerebellum
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Cuneocerebellar tract : serves the same function as the dorsal spinocerebellar, for the arms and upper trunk Ventral Spinocerebellar tract : transmits pain sense from legs and lower trunk to the same side of the brain Eventually is projects to cortex Pontocerebellar tract (brainstem and cerebellum): originates in pontine nuclei and ascends in the middle peduncle (pons) Rostal spinocerebellar tract : serves the same fnction as the ventral tract except for the upper trunk and arm region Olivocerebellar tract (between two hemispheres): provides communication between cerebellar hemispheres and for the spinal cord, medulla (brain stem part) and cortex, via the inferior peduncle Vesitbulocerebellar tract: provides information to the flocculonodular lobe from vestibular nuclei of the cortex (info from cortex to lobe, orientation in space) Cerebellar peduncles : all of the fibers that enter or leave the cerebellum do so by way of the peduncles Functions of the cerebellum: 1) coordinator of integrator of body movements and external and internal environment of the body, its compared to a computer being able to have a variety of input info 2)
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