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G03: Overview of the CNS/PNS
David A. Morton, Ph.D.
Pg. 16
pg. 17
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pg. 17
Neurons -
Functional unit of the nervous system
pg. 17
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CNS
MotorSensory
PNS
(afferent) (efferent)
pg. 17
pg. 17
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pg. 17
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pg. 17
Pg. 17
CNS – Meninges
• Dura mater
• Arachnoid mater
• Pia mater
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Pg. 17
CNS – Meninges
GAFS Fig. 2.59
The Spinal Cord
pg. 19
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CNS – Spinal Cord
Pg. 19
CNS – Spinal Cord
Pg. 19
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CNS – Spinal Cord
Pg. 19
CNS – Spinal Cord
Pg. 19
GAFS Fig. 2.80
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Pg. 19
CNS – Spinal Cord cont …
GAFS Fig. 2.59
The Spinal Cord
pg. 19
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GAFS Fig. 2.59
The Spinal Cord
pg. 19
Spinal Nerves
pg. 21
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Pg. 19
Spinal Roots and Spinal Nerves
Nerve vs. Neuron
PNS- Spinal Nerves
Pg. 19
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
Pg. 23
• Vertebral level
• Spinal cord level
• Spinal nerve level
Pg. 19
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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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THANK-YOU