What Is a Venous Plexus?
Venous plexus is a disease that is mainly divided into vertebral venous plexus, rectal venous plexus, bone venous plexus, and pharyngeal venous plexus. The vertebral venous plexus can be divided into extravertebral and intravertebral venous plexus.
Venous plexus
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- Chinese name
- Venous plexus
- Function
- Prevent backflow
- Exist
- vein
- Classification
- Vertebral venous plexus
- Venous plexus is a disease that is mainly divided into vertebral venous plexus, rectal venous plexus, bone venous plexus, and pharyngeal venous plexus. The vertebral venous plexus can be divided into extravertebral and intravertebral venous plexus.
- The extravertebral venous plexus is located outside the spinal canal, the anterior group is in front of the vertebral body, and the posterior group is behind the vertebrae. Extravertebral venous plexus collects vertebral and adjacent muscle veins and injects them into deep jugular vein plexus, intercostal vein, lumbar vein, and lateral iliac vein. Most of these veins and communication branches have no venous valves, allowing blood to flow back. The intravertebral venous plexus is located in the spinal canal and is distributed between the periosteal and dura mater. The anterior group is roughly two longitudinal venous plexuses behind the vertebral body and on both sides of the posterior longitudinal ligament, collecting the veins from the vertebral body; the posterior group is located on the deep side of the vertebral arch and the ligamentum flavum. Anastomotic branches are connected between the two sides. The vertebral venous plexus collects venous blood from the spinal cord, vertebrae, and ligaments, and it is anastomosed with the occipital sinus, sigmoid sinus, and basal plexus in the skull, and has extensive communication with the extravertebral venous plexus. The vertebral venous plexus not only communicates with the superior and inferior vena cava systems, but also has direct communication with the skull. Some pelvic, abdominal, or thoracic infections, tumors, or parasite eggs can invade the skull directly through the vertebral venous plexus without pulmonary circulation. . When coughing or vomiting, the intraabdominal pressure suddenly increases, forcing the inferior vena cava to be unable to receive the venous blood flow of the abdominal and pelvic cavity as usual. At some instants, the blood flow can return through the lateral iliac vein, lumbar vein and intercostal vein, and then pass through The intravertebral venous plexus is injected into the superior vena cava. Because the vertebral venous plexus is located in the spinal canal, the environment is constant, so it is not affected by changes in abdominal pressure.