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24 Cards in this Set
- Front
- Back
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Primary Fissure of Cerebellum |
divides ant. & post. lobes |
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Horizontal fissure of Cerebellum |
across posterior lobe |
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Posterolateral Fissure of Cerebellum |
divides post. lobe and flocculonodular lobe.
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2 biggest problems with Cerebellar lesions |
#1: Ataxia #2: hypotonia |
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Functions of the Cerebellum |
-Coordinate skilled voluntary movements - Proprioception -Muscle tone - posture -balance |
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Flocculonodular Lobe (aka Vestibulocerebellum, archicerebellum) |
Supports equilibrium w/ connections to vestibular system |
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Anterior lobes and vermis (spinocerebellum, Paleocerebellum) |
supports propulsive automated movements |
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Posterior lobes (cerebrocerebellum, neocerebellum) |
supports coordination of fine movements |
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Lateral subdivisions of cerebellum (& nuclei) |
Vermis -Fastigial nuclei Paravermal region (intermediate zone) - Interposed Nuclei (Globose, Emboliform) Lateral hemisphere - Dentate nuclei |
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Inferior Cerebellar Peduncle |
-Primary input - afferents: spinal cord; lower brainstem; vestibular n. - efferent: to vestibular nuclei |
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middle Cerebellar peduncle |
afferent: contralateral pontine nuc. |
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Superior cerebellar peduncle |
-primary output - afferent from: ventral spinocerebellar tract efferents to: thalamus, spinal cord, and red nucleus |
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Cerebellar Connection Decussations |
*ipsilateral afferent |
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Mossy Fiber Origin: Spinal Cord |
Tract: Dorsal & Ventral Spinocerebellar Peduncle: inferior & Superior Termination: Anterior lobe & vermis |
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Mossy Fiber Origin: pontine nuc. |
Tract: Pontocerebellar Peduncle: middle Termination: Ant. & Post. lobes |
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Afferents to Cerebellum |
Climbing Fibers - From olivary nuleus - Excitatory to Deep Nuclei & Purkinje cells Mossy Fibers |
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Cerebellar Cortex layers |
Molecular - granule cell axons -stellate & basket cells - Purkinje cell dendrites Purkinje cell layer - purkinje cell bodies Granular layer - granule cells - golgi cells - bulbous expansion of mossy fibers |
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Deep Cerebellar nuclei |
Fastigial Interposed - Globose -Emboliform Dentate |
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Efferents from Cerebellum |
from deep cerebellar nuc. excitatory: mossy & climbing fibers inhibitory: purkinje cells |
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Mossy Fibers from vestibular nuclei |
Tract: Vestibulocerebellar Peduncle: Inferior Termination: Flocculonodular lobe |
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Vestibulocerebellum |
Balance, coordination of head & eyes Vestibular receptors --> *Flocculonodular lobe --> vestibular nuclei --> Medial descending system (vestibulospinal tract) *can bypass |
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Cerebrocerebellum |
Program and Initiate movement. Cerebral cortex --> *Hemispheres of cerebellum --> Dentate nucleus** --> Lateral & medial descending system or red nucleus *Can bypass **Dentate nucleus sends info to cerebral cortex via thalamus before it descends. |
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Spinocerebellum via Vermis |
Axial & Girdle Muscles Spinal cord --> *Vermis --> Fastigal nuc.** --> medial descending *can bypass ** via reticulospinal, vestibulospinal, ventral corticospinal tracts |
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Spinocerebellum via Paravermis |
Distal limb muscles (voluntary & some proprioceptive movements) Spinal cord --> *paravermal --> interposed nuc. ** --> lateral descending *can bypass ** via rubrospinal, lateral corticospinal tracts |
