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The number of vertebrae in a region can vary but overall the number remains the same. In a human spinal column, there are normally 33 vertebrae. [3] The upper 24 pre-sacral vertebrae are articulating and separated from each other by intervertebral discs, and the lower nine are fused in adults, five in the sacrum and four in the coccyx, or tailbone.
An intervertebral disc (British English), also spelled intervertebral disk (American English), lies between adjacent vertebrae in the vertebral column.Each disc forms a fibrocartilaginous joint (a symphysis), to allow slight movement of the vertebrae, to act as a ligament to hold the vertebrae together, and to function as a shock absorber for the spine.
In humans, cervical vertebrae are the smallest of the true vertebrae and can be readily distinguished from those of the thoracic or lumbar regions by the presence of a foramen (hole) in each transverse process, through which the vertebral artery, vertebral veins, and inferior cervical ganglion pass. The remainder of this article focuses upon ...
Disc herniation can occur in any disc in the spine, but the two most common forms are lumbar disc herniation and cervical disc herniation. The former is the most common, causing low back pain (lumbago) and often leg pain as well, in which case it is commonly referred to as sciatica. Lumbar disc herniation occurs 15 times more often than ...
A number of structures pass through the IVF: spinal nerve roots, a recurrent meningeal nerve, [3] radicular arteries (where present), [4] [2]: 492–493 segmental medullary arteries (where present), [4] intervertebral veins, [5] and lymphatic vessels. [3] The posterior (dorsal) root ganglion is situated within the IVF.
"Obesity is a major factor in causing acute and chronic back pain due to several factors, including the overload on the spinal column," says Dr. Medhat Mikhael, MD, a pain management specialist ...
The spinal cord is an estimated 45 centimetres (18 inches) long in males and about 43 cm (17 in) in females. [citation needed] It is ovoid-shaped and is enlarged in the cervical and lumbar regions. The cervical enlargement, stretching from the C4 to T1 vertebrae, is where sensory input comes from and motor output goes to the arms and trunk.
Total disc replacement (TDR), or artificial disc replacement (ADR), is a type of arthroplasty in which degenerated intervertebral discs in the vertebral column are replaced with artificial disc implants in the lumbar (lower) or cervical (upper) spine.
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