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The intervertebral foramen (also called neural foramina, and often abbreviated as IV foramina or IVF), is a foramen between two spinal vertebrae. Cervical, thoracic, and lumbar vertebrae all have intervertebral foramina. The foramina, or openings, are present between every pair of vertebrae in these areas. A number of structures pass through the foramen. These are the root of each spinal nerve, dorsal root ganglion, the spinal artery of the segmental artery, communicating veins between the internal and external plexuses, recurrent meningeal (sinu-vertebral) nerves, and transforaminal ligaments.
An intervertebral disc is made up of two parts: the annulus fibrosus and the nucleus pulposus.The annulus fibrosus is the outer layer of the disc that encompasses the gel-like nucleus pulposus inside the disc.Made of strong layers of collagen fibers woven together at varying angles, the annulus fibrosus gives structure to the disc and allows for even weight distribution of surrounding vertebrae.he annulus fibrosus is the outer layer of the disc that encompasses the gel-like nucleus pulposus inside the disc. Made of strong layers of collagen fibers woven together at varying angles, the annulus fibrosus gives structure to the disc and allows for even weight distribution of surrounding vertebrae.