Spine And Nerves Structure
Spinal cord and its membranes are supplied by the arteries going by the front and rear surfaces of the brain (aa splnales ant. Et post.). And in the lumbar part, in addition to branches, it is (Online Pharmacy Without Prescription) supplied with lumbalis, entering the spinal canal through the intervertebral holes. Reverse flow of blood is sent to the venous plexus, embedded in the epidural space. This plexus by anastomosis, which pass along with spinal nerve roots through the holes, is connected to the venous plexus, located on the surface of the vertebras in the form of segmented and linked rings.
Each spinal nerve is composed of sensory, motor and autonomic fibers and exits the spinal cord by two roots: rear (sensitive) and anterior (motor). The roots are made up of individual nerve fibers going to the front and rear surfaces of the segments of the spinal cord. After the merger of these fibers, outwards are directed in the trunk spines, where it converges with the dura mater, near the intervertebral holes.
At the exit from the spinal canal, both spines are connected by connective tissue. Strictly roots are part of them coming from the spinal cord to the junction. And after the merger (and prior to their exit from the spinal canal), the roots are called as the radicular nerves. The spinal unit is located in the system of radicular nerve. It consists of sensitive neuron cells. The motor part of the radicular nerve adjacent to the site from the front side and connects with fiber. All this formation is connected with periosteal, covering the intervertebral opening
Part of the nerve located between the ganglion and the plexus is called as the cord – funiculus (according to Sukkar). Cord includes fibers of sympathetic nerves running from the ganglia of the boundary pillars in the form of rami communicantes grisei. Sympathetic fibers are sent from the spinal centers in the anterior root ganglia of the boundary pillars in the form of rami communicantes albi. Parasympathetic fibers of the sacral division look toward low lumbar and sacral spinal cord segments in the respective roots.
Due to the fact that the segments of the spinal cord and spinal are not topographically matched, the roots have caudal direction behind the exit out. Beginning from I-II of the lumbar vertebra, where the spinal cord ends, the roots are going down as the compact brush, located around the final thread (horse’s tail – cauda equina). Prior to II-III sacral vertebra horse’s tail is located inside the dural sac, and below is outside of it. And ganglion of sensory root does not lie in the channels of the sacral bones in this part (intervertebral holes), but within the sacral canal.
Mixed nerves look out from the spinal canal at the respective vertebra: so, the first lumbar nerve is located under the 1st lumbar vertebra, the fifth lumbar nerve is located under the 5th lumbar vertebra.
When leaving out every nerve divides into two branches: a large front and rear lower. Back branches are sent to the muscles and skin of the lower back, front ones joining together in a connection, form the so-called Plexus, which the long branches depart from that innervate pelvic girdle and lower limbs.
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