Thecal sac The dura mater and arachnoid mater are collectively called the dural sac or the thecal sac. This sac covers the conus medullaris, cauda equina, and each individual spinal nerve root as it courses out of the cauda equina and travels into the intervertebral foramen (bony opening through which the nerve exits the spinal canal). 2 Darby SA.
Relieve neural tissue compression. Stenosis of the spinal canal in the lumbar region may cause compression of the spinal cord, thecal sac, spinal dura, and/or the cauda equina. When one or more of these structures are compressed, neurogenic claudication (leg pain while walking or bending the spine backward) may occur, typically affecting both legs. A CT scan with myelogram dynamically demonstrates the structures that contact, compress, or displace the spinal cord, nerve roots, and/or thecal sac (group of membranes surrounding the spinal cord and cauda equina), assisting in the diagnosis of back or neck pain from 1 Patel DM, Weinberg BD, Hoch MJ.
thecal sac, A synovial cyst is a fluid-filled sac that develops in the spine due to degeneration. The cyst itself is benign, but it can cause symptoms ranging from mild discomfort to severe neurological complications requiring immediate medical attention. Many people with a synovial cyst develop all the symptoms of stenosis of the spine, which can include pain and/or neurological symptoms. For others, the ... The L5-S1 spinal motion segment, also called the lumbosacral joint, is the transition region between the lumbar spine and sacral spine in the lower back.
thecal sac, In this region, the curvature of the spine changes from lumbar lordosis (forward curve) to sacral kyphosis (backward curve). L5-S1 helps transfer loads from the spine into the pelvis and legs.
