https://www.coloradospineinstitute.com/education/anatomy/intervertebral-discs Learn about degenerative disc disease, sciatica, and radiculopathy causes, symptoms (cervical, lumbar, thoracic, buttock … The nucleus of the disc acts as a shock absorber, absorbing the impact of the body's activities and keeping the two vertebrae separated. While doctors can easily identify a large or obvious abnormality of the disc, being able to define more subtle abnormalities can be difficult. Your discs, which also cushion your spine’s movement and help you bend and twist, can start to wear out, too, as you grow older or as you put a lot of strain on your spine. Spinal disks are rubbery pads between the vertebrae, the specialized bones that make up the spinal column. The 33 vertebrae make up five distinct spine segments. A single-cushion seat offers a tidy, minimal look but also can be combined with a pillow back, which is more about casual comfort than minimalism. The space between the two hemispheres is called the great longitudinal fissure. discogenic pain: pain arising from degenerative changes in the intervertebral discs. disc (intervertebral disc): a fibrous cushion that separates spinal vertebrae. Has two parts, a soft gel-like center called the nucleus and a tough fibrous outer wall called the annulus. The nucleus pulposus contains loose fibers suspended in a mucoprotein gel. Being able to identify disc abnormalities is important because they can be painful. This is the case with abnormalities in the disc, the cushion between the bones of the back, called the vertebrae.. Your cervical spine is made up of the 7 bones, called cervical vertebrae, stacked on top of each other forming the neck area. They act as shock absorbers to allow your neck to move freely. Starting at the neck and going down toward your buttocks (rear end), these segments include: Cervical (neck): The top part of the spine has seven vertebrae (C1 to C7). The three atlanto-axial joints are also synovial joints. The vertebrae are divided into three regions: cervical C1–C7 vertebrae, thoracic T1–T12 vertebrae, and lumbar L1–L5 vertebrae. Doctors call them intervertebral disks. One is found between the dens (odontoid process) of the axis (2nd cervical vertebra) and the anterior arch of the atlas (1st cervical vertebra), and two are located between the lateral masses of the 1st cervical vertebra and the superior articular facets of the 2nd cervical vertebra. Degenerative disc disease is the gradual deterioration of the discs between the vertebrae. Single-cushion seat: Oftentimes a sofa seat will have just a single cushion. nucleus (nucleus pulposus): soft gel-like center of an intervertebral disc. Synovial Joint Definition. If your discs wear out, it’s usually called degenerative disc disease, which is a separate spinal condition from spondylosis, but … There is one disc between each pair of vertebrae, except for the first cervical segment, the atlas. The corpus callosum connects the two sides and transfers signals from one side of the brain to the other. This is also called a bench seat. A synovial joint is a connection between two bones consisting of a cartilage lined cavity filled with fluid, which is known as a diarthrosis joint. It is the remnant of the notochord. Pain that radiates down the leg is a symptom of sciatica. When you sit down on one end of a good single cushion, it will not rise up on the other end. The vertebral column is curved, with two primary curvatures (thoracic and sacrococcygeal curves) and two secondary curvatures (cervical and lumbar curves). The cervical disks are the cushions that lie between the cervical vertebrae. 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