Chapter 11.pdf - Chapter 11 The Spinal Cord and Peripheral Nerves Spinal Cord Location and Size Continuation of the brain stem Tube-like structure

Chapter 11.pdf - Chapter 11 The Spinal Cord and Peripheral...

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Chapter 11: The Spinal Cord and Peripheral Nerves Spinal Cord: Location and Size Continuation of the brain stem Tube-like structure located in the spinal cavity Extends from foramen magnum to L1 Diameter similar to the thickness of the thumb Gray on the Inside, White on the Outside Gray matter (Butterfly) Dorsal horn Cell bodies, intraneurons, and synapses Ventral horn Central canal White matter Location of tracts ( Ascending : brings information from PNS to brain. Descending : information from brain to PNS) Decussation : cross over of fibers for communication What the Spinal Cord Does Sensory pathway : information from PNS to brain Motor pathway : brain to PNS Reflex cente r: spinal cord is reflex center Reflexes and The Reflex Arc Receptor Afferent neuron Integrating center Efferent neuron Effector organ Examples of Reflexes Withdrawal reflex Organ reflexes Nerve vs. Neuron Neuron : A single nerve cell Nerve : Bundles of neurons with fascia and blood supply Peripheral Nervous System: Two Classification Systems Structural classification: origin of the fiber Cranial nerves
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