1. Spinal Cord- Structure and Function Pages 252-255
The Nervous System
Spinal Cord- Structure and Function
Pages

2. Review of nervous system terms
Neurons = nerve cells
Nerve cell bodies = ganglia (ganglion is singular)
Bundles of nerve fibers:
In the CNS = tracts
In the PNS = nerves

3. Spinal Cord Begins at the foramen magnum of the skull
Terminates around first or second lumbar vertebra
conduction pathway Approaching/Exiting the brain
Afferent vs. Efferent
31 pairs of spinal nerves arise from the spinal cord
Cauda equina (horse’s tail)
a dense collection of spinal nerves at the inferior end
Meninges cover the spinal cord
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4. Figure 7.20 Anatomy of the spinal cord, posterior view.
Cervical spinal nerves C8
Dura and arachnoid mater
Thoracic spinal nerves
T12
End of spinal cord
Lumbar spinal nerves
Cauda equina L5
End of meningeal coverings S1
Sacral spinal nerves S5

5. Figure 7.21 Spinal cord with meninges (three-dimensional view).
White matter
Dorsal (posterior) horn of gray matter
Dorsal root ganglion
Central canal
Lateral horn of gray matter
Spinal nerve
Ventral (anterior) horn of gray matter
Dorsal root of spinal nerve
Ventral root of spinal nerve
Pia mater
Arachnoid mater
Dura mater
ANTERIOR

6. Spinal Cord Anatomy Gray Matter: Horns of the spinal cord
Collection of neuron cell bodies
Dorsal (posterior) horns (SENSORY)
house interneurons
Receive sensory info from neurons in the dorsal root
Anterior (ventral) horns (MOTOR)
house somatic (voluntary) motor neurons
Send motor information out ventral root
White Matter: myelinated axons
the central canal is filled with CSF

7. Figure 7.21 Spinal cord with meninges (three-dimensional view).
White matter
Dorsal (posterior) horn of gray matter
Dorsal root ganglion
Central canal
Lateral horn of gray matter
Spinal nerve
Ventral (anterior) horn of gray matter
Dorsal root of spinal nerve
Ventral root of spinal nerve
Pia mater
Arachnoid mater
Dura mater
ANTERIOR