ANAT 2646 Descending Tracts

ANAT 2646 Descending Tracts - Acts on axial motor neurons...

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Upper and Lower Motor Neurons Upper = Corticospinal Lower = Brainstem and spinal cord
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Cell Types Alpha Motor Gamma Motor Renshaw Cells
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Corticospinal Tract 60-80% from primary motor cortex Corona radiata Crus cerebri Pyramidal tract 80% cross as lateral corticospinal 10% cross as anterior corticospinal 10% remain ipsilateral
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Lateral corticospinal Distal limb motor neurons Renshaw cells Excitatory interneurons Presynaptic inhibitory neurons
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Reticulospinal Tracts Locomotion Posture
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Tectospinal Tract Crossed
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Unformatted text preview: Acts on axial motor neurons Vestibulospinal Tract Uncrossed Center of gravity Raphespinal Tract Raphe nucleus posterolateral tract of Lissaur modulates sensory information between 1st and 2nd order neurons Aminergic Pathways Serotonin (5-HT) Adrenergic Noradrenergic Central Autonomic Pathways Fibers descend in intermediate gray matter Intermediolateral cell column (preganglionic) Sympathetic (baroreflex) Parasympathetic (bladder function) pons...
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This note was uploaded on 11/23/2011 for the course ANAT 2646 taught by Professor Ronaldg.mayne during the Winter '11 term at Life Chiropractic College West.

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ANAT 2646 Descending Tracts - Acts on axial motor neurons...

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