Lab 4 - External and Internal Anatomy of the Spinal Cord

External Landmarks - Cross Sectional Diagram

Pia-Arachnoid

The diagram shows the external landmarks of the spinal cord at low thoracic levels. Locate the following longitudinal fissures and sulci, which divide the spinal cord: 

  • anterior median fissure
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  • posterior median sulcus
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  • posterolateral sulcus
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  • posterior intermediate sulcus
  •  
  • anterolateral sulcus

  • Note that the posterior intermediate sulcus is present only above level T6.