Pyramidal Motor System_08

Pyramidal Motor System_08 - • Hypoglossal n – crossed...

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Pyramidal System Mammalian Two neuron pathway from the cortex to muscles
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Pyramidal Tract Efferent pathway from the cortex crossing in the pyramis of the medulla oblongata 90% of the neurons are 1-4μ diameter 2% are 10 – 20 µ in diameter (Betz cells) 95% are myelinated 60% originate in Pre-central gyrus 30% from frontal lobe anterior to PCG
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Pyramidal Tract Corticospinal Tract UMN to arms, trunk, and legs 90% crossed, 10% uncrossed Corticonuclear Tract UMN to brainstem nuclei Lower facial n. – crossed only
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Unformatted text preview: • Hypoglossal n. – crossed only • Spinal Accessory n. – uncrossed only Upper MN Lesion • Contralateral Hemiplegia • Paralysis of fine skilled movement of fingers and lips • Hypotony for 1 to 2 days followed by spasticity Upper MN Lesion • Abnormal reflexes – Babinski – Hoffman – Accentuated DTR’s and clonus • Spasticity after 1 week – Flexors UE – Extensors LE • No muscle atrophy Lower MN Lesion • Total flaccid paralysis • Muscle atrophy • Fasiculations • De-innervation Supersensitivity...
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This note was uploaded on 09/28/2009 for the course BME 365R taught by Professor Rylander during the Fall '09 term at University of Texas.

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Pyramidal Motor System_08 - • Hypoglossal n – crossed...

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