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PNS II (MO) - Peripheral Nervous System Spinal Nerves And...

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    Peripheral Nervous System Peripheral Nervous System Spinal Nerves Spinal Nerves And And Plexuses Plexuses
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    2 Components of PNS 2 Components of PNS 1. 1. 12 pr. of  12 pr. of  cranial nerves cranial nerves 2. 2. 31 pr. of  31 pr. of  spinal nerves spinal nerves What is a spinal nerve? What is a spinal nerve?
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What is a spinal nerve? There are 31 pair of spinal nerves. They enter and leave the spinal cord through the intervertebral foramen.
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Spinal Nerve
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What is a spinal nerve? A spinal nerve has two components: 1. Sensory fibers (axons) going into the spinal cord 2. Motor fibers (axons) leaving the spinal cord 3. These two components split from each other once the spinal nerve is inside the vertebral foramen Posterior root – sensory axons entering spinal cord Anterior root – motor axons leaving spinal cord
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Spinal Nerve
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Spinal Nerve
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Spinal Nerve Roots Posterior root – enters spinal cord with sensory information Anterior root – leaves spinal cord with motor information
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Spinal Nerve Reflex Simple reflex is a 2 neuron circuit
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Spinal Nerve 1 2 3 4 5 6 7
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