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21 Cards in this Set
- Front
- Back
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Archicerebellum (vestibulocerebellum) |
-Flocculonodular lobe + lingula -Chiefly vestibular in connections -Axial musculature and bilateral movements used for locomation and maintenance of equilibrium. |
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Paleocerebellum (Spinocerebellum) |
-ant lobe (except lingula), and the pyramid and uvula of the inferior vermis. -chiefly spinocerebellar -tone, posture, crude movements of limbs. |
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Neocerebellum |
-posterior lobe (except the pyramid and the uvula of the inferior vermis) -fine movements of the body. |
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Functional zones |
1. Lateral 2. Intermediate 3. Vermis |
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Lateral zone |
Planning, programming and coordination of muscular activity of distal parts of limbs. -Connected with association areas of the brain |
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Intermediate zone |
Control of muscles of flexor group via rubrospinal tract. |
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Vermis/Median zone |
Control of extensor muscles, trunk, neck, shoulder and hips through vestibulospinal and reticulospinal tracts. |
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Superior cerebellar peduncle is chiefly? |
Efferent |
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Middle and Inferior cerebellar peduncle are chiefly? |
Afferent |
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Superior cerebellar peduncle |
Efferent: Cerebellorubral tract Dentatothalamic tract Afferent: Ant spinocerebellar tract Tectocerebellar tract |
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Middle cerebellar peduncle |
Mostly afferent Pontocerebellar fibres |
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Inferior cerebellar peduncle |
Afferent: Posterior spinocerebellar tract Cuneocerebellar tract Olivocerebellar tract Striae medullaris |
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Nuclei in cerebellum |
1. Nucleus dentatus- neocerebellar 2. Nucleus globosus 3. Nucleus emboliformis- paleocerebellar 4. Nucleus fastigii- archicerebellar |
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Histology |
Homotypical 3 layers: 1. Molecular layer- unmyelinated nerve fibres. 2. Intermediate layer- single layer of cell bodies of purkinje cells. 3. Inner layer- cell bodies and dendrites of granule cell, Golgi cells. |
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Purkinje cells |
Large, flask shaped. Stimulated by climbing fibres coming from inferior olivary nucleus. |
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Granule cell |
Small rounded cells with dendrites. Only Excitatory cell.- Glutamine is the neurotransmitter. |
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Stellate and basket cell |
Cell bodies at right angle to the long axis of the folium. |
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Golgi cells |
Largest neurons. Input: parallel fibres, climbing fibres and mossy fibres. Output: granule cells |
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Afferent connections |
Mossy fibres- all afferents (except olivocerebellar fibres). Synapse with granule and Golgi cells. Glutamate. Climbing fibres- olivocerebellar fibres. Synapse with dendrites of purkinje cells. Aspartate. |
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Functions of cerebellum |
1. Tone, posture, equilibrium by flocculonodular lobe. 2. Tone, posture and crude movements by anterior lobe. 3. Smooth, accurate and balanced movements by middle lobe. |
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Development |
From neurons of the alar lamina of metencephalic part of the rhombencephalic vesicle. |
