a&p 13 spinal cord
TRANSCRIPT
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The Spinal Cord
Human Anatomy and Physiology
L|E|C|O|M Mathew J. Bateman, Ph.D., D.H.Ed.
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Functions of the Spinal Cord
Conduction
Locomotion
Reflexes
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Gross Anatomy of Lower Spinal Cord
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Cross-Sectional Anatomy of the Spinal Cord
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Cross Section of Spinal Cord
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Spinal Tracts
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General Anatomy of a Nerve
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Spinal Nerve Roots and Plexuses
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Branches of a Spinal Nerve
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The Cervical Plexus
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The Brachial Plexus
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The Lumbar Plexus
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The Sacral Plexuses
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Cutaneous Innervation and
Dermatomes
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Reflexes
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The Muscle Spindle
• Sense organ (proprioceptor) that monitors length of muscle and how fast muscles change in length
• Composed of intrafusal muscle fibers, afferent fibers and gamma motorneurons
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The Patellar Tendon Reflex Arc
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Flexor Withdrawal Reflexes
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Crossed Extensor Reflexes
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Golgi Tendon Reflex
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Spinal Cord Trauma
• 10-12,000 people/ year are paralyzed
• 55% occur in traffic accidents
• This damage poses risk of respiratory failure
• Early symptoms are called spinal shock
• Tissue damage at time of injury is followed by post-traumatic infarction