The document discusses the anatomy of the spinal cord. It notes that the spinal cord extends from the skull down to the lumbar vertebrae and gives rise to 31 pairs of spinal nerves. The spinal cord contains gray matter surrounding a central canal filled with cerebrospinal fluid, and white matter conduction tracts including dorsal, lateral, and ventral columns. Diagrams label and illustrate these key anatomical features and structures of the spinal cord.

1. PowerPoint® Lecture Slide Presentation
by Patty Bostwick-Taylor,
Florence-Darlington Technical College
The Nervous
System
7
PART D
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings

2. Spinal Cord
 Extends from the foramen magnum of the skull to
the first or second lumbar vertebra
 31 pairs of spinal nerves arise from the spinal
cord
 Cauda equina is a collection of spinal nerves at
the inferior end
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings

3. Spinal Cord Anatomy
Figure 7.20 (1 of 2)
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings

4. Spinal Cord Anatomy
Figure 7.20 (2 of 2)
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings

5. PNS: Spinal Nerves
Figure 7.25a
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings

6. Spinal Cord Anatomy
 Internal gray matter is mostly cell bodies
 Dorsal (posterior) horns
 Anterior (ventral) horns
 Gray matter surrounds the central canal
 Central canal is filled with cerebrospinal
fluid
 Exterior white mater—conduction tracts
 Dorsal, lateral, ventral columns
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings

7. Spinal Cord Anatomy
Figure 7.21
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings