g03: overview of the cns/pns cns.pns morton 2008.ppt.pdfof the body to the cns (via dorsal roots)...
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G03: Overview of the CNS/PNS
David A. Morton, Ph.D.
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Neurons -
Functional unit of the nervous system
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CNS
MotorSensory
PNS
(afferent) (efferent)
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CNS – Meninges
• Dura mater
• Arachnoid mater
• Pia mater
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CNS – Meninges
GAFS Fig. 2.59
The Spinal Cord
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CNS – Spinal Cord
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CNS – Spinal Cord
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CNS – Spinal Cord
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CNS – Spinal Cord
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GAFS Fig. 2.80
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CNS – Spinal Cord cont …
GAFS Fig. 2.59
The Spinal Cord
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GAFS Fig. 2.59
The Spinal Cord
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Spinal Nerves
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Spinal Roots and Spinal Nerves
Nerve vs. Neuron
PNS- Spinal Nerves
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Regions of the Spinal Cord and Verterbral Column
Region Number of Spinal Nerves
Number of Vertebrae
Cervical 8 7
Thoracic 12 12
Lumbar 5 5
Sacral 5 5
Coccygeal 1 4
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Rami
At each spinal cord level:
• Roots join to become spinal nerves
• Spinal nerves divide into rami
• Posterior rami – back
• Anterior rami – neck, thorax, abdomen, pelvis,
perineum, limbs
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• Vertebral level
• Spinal cord level
• Spinal nerve level
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PNS – Sensory neurons
Conduct sensory information from the tissues
of the body to the CNS (via dorsal roots)
Pg. 23Dorsal root = Posterior root
PNS – Motor neurons
Conduct motor information from the CNS to
the tissues of the body (via ventral roots)
Ventral root = Anterior rootPg. 23
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PNS – Dermatomes
Spinal nerves are segmentally arranged Pg. 15
Anterior rami
GAFS Fig. 3.32
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Anterior rami
• Cervical plexus
• Brachial plexus
• Thoracic nn.
• Lumbar plexus
• Sacral plexus
NS Overview
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