SINUSES, VERTEBRAL
\sˈa͡ɪnəsɪz], \sˈaɪnəsɪz], \s_ˈaɪ_n_ə_s_ɪ_z]\
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Two great venous sinuses, different from those of the dura mater, which extend the whole length of the vertebral canal, from the occipital foramen to the end of the sacrum, behind the bodies of the vertebrae, before the dura mater, and at the sides of the posterior vertebral ligament. At their inner side they communicate with each other by means of branches, which form true transverse sinuses. They are situate at the middle of the body of each vertebra, passing under the posterior vertebral ligament. They receive, at their middle part, the veins that arise in the spongy tissue of the vertebrae. By their external side, the vertebral sinuses communicate with the posterior branches of the vertebral, intercostal, and lumbar veins. At their posterior side they receive the veins, which creep on the prolongation of the dura mater that envelops the marrow.
By Robley Dunglison
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