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Peripheral Nervous System. Spinal Nerves And Plexuses. 2 Components of PNS. 12 pr. of cranial nerves 31 pr. of spinal nerves What is a spinal nerve?. 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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peripheral nervous system

Peripheral Nervous System

Spinal Nerves

And

Plexuses

2 components of pns
2 Components of PNS
  • 12 pr. of cranial nerves
  • 31 pr. of spinal nerves
  • What is a spinal nerve?
what is a spinal nerve
What is a spinal nerve?
  • There are 31 pair of spinal nerves.
  • They enter and leave the spinal cord through the intervertebral foramen.
what is a spinal nerve1
What is a spinal nerve?
  • A spinal nerve has two components:
  • Sensory fibers (axons) going into the spinal cord
  • Motor fibers (axons) leaving the spinal cord
  • 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
spinal nerve roots
Spinal Nerve Roots
  • Posterior root – enters spinal cord with sensory information
  • Anterior root – leaves spinal cord with motor information
spinal nerve reflex
Spinal Nerve Reflex
  • Simple reflex is a 2 neuron circuit
spinal nerve4
Spinal Nerve
  • Cell body of sensory neuron
  • Posterior (sensory) root
  • Posterior root ganglion
  • Anterior (motor) root
  • Cell body of motor neuron
  • Axon of motor neuron
  • Spinal nerve
slide12

Dermatome

An area of skin supplied

by a single spinal nerve

Shingles

Inflammation of a

dermatome caused by

chickenpox virus….rash,

blisters and pain…chance

of secondary infection by

bacteria

nerve plexuses
Nerve Plexuses
  • A plexus is a network of spinal nerves on both L&R sides of the spinal cord.
  • A plexus will ultimately produce peripheral or “named” nerves.
  • There are four plexuses:
  • Cervical
  • Brachial
  • Lumbar
  • Sacral
study hint for plexuses
Study Hint for Plexuses
  • Table with 5 columns
  • Plexus name
  • Spinal nerves in that plexus
  • Peripheral “named” nerves generated from that plexus
  • Compartment innervated by each peripheral nerve
  • Muscle function of each peripheral nerve
1 cervical plexus1
1. Cervical Plexus
  • C1 – C4
  • Phrenic n.
  • Innervates the diaphragm
  • Comprised of contributions from C3, C4 & C5
  • Paralysis of diaphragm and death
2 brachial plexus1
2. Brachial Plexus
  • C5 – T1 (How many spinal nerves in this plexus?)
  • This plexus generates peripheral (“named”) nerves that supply sensory and motor innervation to the upper extremities
  • Five major peripheral nerves are generated from this plexus.
2 brachial plexus2
2. Brachial Plexus
  • Axillary
  • Radial
  • Musculocutaneous
  • Median
  • Ulnar
3 lumbar plexus1
3. Lumbar Plexus
  • L1 – L4
  • This plexus generates peripheral nerves that provide sensory and motor innervation to portions of the lower extremies
  • Two major peripheral nerves are generated from this plexus
3 lumbar plexus2
3. Lumbar Plexus
  • Femoral
  • Obturator
4 sacral plexus1
4. Sacral Plexus
  • L4 – S4
  • This plexus generates peripheral nerves that provide sensory and motor innervation to portions of the lower extremies
  • Three peripheral nerves are generated from this plexus
4 sacral plexus2
4. Sacral Plexus
  • Sciatic
  • Tibial
  • Common fibular
sciatic n
Sciatic n.
  • Composed of tibial and common fibular divisions wrapped in a common sheath