Spinal Cord Section Inside the Vertebra and Cerebrospinal Fluid

Description

Centered within the vertebral canal, the spinal cord is shown in transverse section with the H-shaped gray matter surrounded by white matter funiculi. A thin pia mater closely invests the cord surface, while the arachnoid mater and dura mater form concentric sleeves more peripherally, defining the subarachnoid space filled with cerebrospinal fluid (CSF, liquor). Dorsal and ventral rootlets course laterally from the posterolateral and anterolateral sulci toward the intervertebral foramen, and segmental vessels track along the meninges toward the cord. Bone forms the outer boundary. That CSF-filled subarachnoid space is not just an anatomic moat, it is the working buffer that limits cord deformation during physiologic motion and during trauma, and it is the space accessed by lumbar puncture and intrathecal drug delivery below the conus medullaris. This cross-sectional arrangement also explains common compression patterns: epidural hematoma or metastatic disease first effaces the thecal sac and CSF before producing cord signal change, while intradural extramedullary lesions displace the cord within the fluid column and intramedullary pathology expands the parenchyma itself. Small details matter here, including the proximity of radicular vessels to the nerve roots and the vulnerability of spinal cord perfusion in hypotensive states. Use this plate for teaching spinal cord meninges and CSF circulation in gross anatomy, neuroanatomy, and anesthesiology blocks, or as a clean reference figure in radiology and neurosurgery materials explaining thecal sac compression, myelography, and spinal canal stenosis. It also supports patient-facing education on lumbar puncture, spinal anesthesia, and cord injury mechanics without oversimplifying the meningeal layers. Anatomical accuracy verified by SciePro's Medical Advisory Board.