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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  • Winter '11
  • RonaldG.Mayne
  • Corticospinal tract, primary motor cortex, Vestibulospinal Tract, tectospinal tract, Raphespinal Tract

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