Extradural neural axis compartment.

Area of Science:

• Anatomy
• Neuroscience
• Surgical Anatomy

Background:

• The extradural neural axis compartment (EDNAC) is a continuous anatomical structure.
• It extends from the coccyx to the orbit, housing vital neurovascular elements.
• Previous understanding may have fragmented this continuous pathway.

Purpose of the Study:

• To emphasize the continuous nature of the extradural neural axis compartment (EDNAC).
• To highlight the anatomical connections within the EDNAC, particularly at the skull base.
• To improve anatomical education by presenting a unified view of the EDNAC.

Main Methods:

• Review and synthesis of existing anatomical literature.
• Emphasis on the continuity of the EDNAC from spinal to cranial segments.
• Correlation of anatomical segments, including the lateral sellar compartment (cavernous sinus).

Main Results:

• The EDNAC is a lengthy, continuous compartment containing arteries, nerves, and valveless veins.
• Adipose tissue distribution varies within the EDNAC, being abundant in orbital and spinal segments but sparse at the skull base.
• The lateral sellar compartment is identified as an integral, enlarged segment of the EDNAC.

Conclusions:

• Understanding the EDNAC as a continuous entity, especially its skull base segment, is crucial for anatomical comprehension.
• The EDNAC links the orbit to the extradural space and Breschet's veins.
• A holistic view of the EDNAC reflects 'living anatomy' over static anatomical descriptions.