Figure 7
From: The function and structure of the cerebrospinal fluid outflow system
Diagrammatic representations of the types of meningeal and vascular relationships found in spinal nerve roots. A: arachnoidal cells within dura mater. B: complete penetration of arachnoid villus into interstitium surrounding spinal root. C: penetration of arachnoid villus into epidural spinal vein D and E arachnoidal proliferations within subarachnoid space (reproduced with permission from Welch and Pollay [37]).