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Spinal Cord Segments – Cross-sectional Anatomy

  • The spinal cord is made up of 31 image descriptionsegments.
Cross section of the spinal cord showing 2 lumbar segments, gray matter, white matter and spinal nerve
Spinal segments (L2,L2) showing the spinal nerve
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  • In cross-section (c.s.), the segments appear to be divided into two zones.
  • The outer zone contains many image descriptionmyelinated axons that run up and down the spinal cord.
Cross section of the spinal cord showing 2 lumbar segments, gray matter, white matter and spinal nerve
Spinal segments (L2,L2) showing histology image of the Myelinated axons of the white matter
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  • Myelin is mostly lipid and light in color. Therefore, this zone is referred to as image descriptionwhite matter.
Cross section of the spinal cord showing 2 lumbar segments, gray matter, white matter and spinal nerve
Spinal segments (L2,L2) showing the white matter of the spinal cord
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Cross section of the spinal cord showing 2 lumbar segments, gray matter, white matter and spinal nerve
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  • This zone lacks myelin and is darker in color. It is therefore referred to as image descriptiongray matter.
Cross section of the spinal cord showing 2 lumbar segments, gray matter, white matter and spinal nerve
Spinal segments (L2,L2) showing the gray matter of the spinal cord
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  • Almost dividing the spinal cord in half are two longitudinal grooves.
  • The narrow indentation that partitions the back surface is known as the image descriptiondorsal median sulcus (or posterior median sulcus) and the broader groove that partitions the front surface is called the image descriptionventral median fissure (or anterior median fissure).
Cross section of the spinal cord showing 2 lumbar segments, gray matter, white matter and spinal nerve
Spinal segments (L2,L2) showing Dorsal median sulcus of the spinal cord
Spinal segments (L2,L2) showing the Ventral median fissure of the spinal cord
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Microscope image of the spinal cord segment [ image descriptionShow / image descriptionHide ]

Microscope image of the spinal cord segment showing (white matter, gray matter,
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Overview:

Image showing the parts of the spinal cord segment without answers
Image showing the parts of the spinal cord segment with answers, Dorsal median sulcus, Gray and White matters, Spinal nerve and Ventral median fissure
Swipe to show/hide the answers
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