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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «S»:

  1. Spinal muscular atrophy Spinal muscular atrophy
    Spinal muscular atrophy: A genetic disease characterized by progressive loss of lower motor neurons (anterior horn cells) in the spinal cord, resulting in symmetric muscle weakness and atrophy. The onset of the progressive muscle weakness ranges greatly in age from before birth to adulthood. The mus...
  2. Spinal nerve Spinal nerve
    Spinal nerve: One of the nerves that originates in the spinal cord. There are 31 pairs of spinal nerves. They consist of the 8 cervical nerves, 12 thoracic nerves, 5 lumbar nerves, 5 sacral nerves, and 1 coccygeal nerve....
  3. Spinal stenosis Spinal stenosis
    Spinal stenosis: Narrowing of the spaces in the spine, resulting in compression of the nerve roots or spinal cord by bony spurs or soft tissues, such as disks, in the spinal canal. This occurs most often in the lumbar spine (in the low back) but also occurs in the cervical spine (in the neck) and l...
  4. Spinal Tap Spinal Tap
    Spinal tap: Also known as a lumbar puncture or "LP", a spinal tap is a procedure whereby spinal fluid is removed from the spinal canal for the purpose of diagnostic testing. It is particularly helpful in the diagnosis of inflammatory diseases of the central nervous system, especially infections, ...
  5. Spindle cell Spindle cell
    Spindle cell: A cell that is tapered at both ends....
  6. Spindle neuron Spindle neuron
    Spindle neuron: A large neuron tapered at both ends that is only found in humans and great apes and so is thought to be a relatively recent evolutionary addition to the nervous system. Spindle neurons are confined to the anterior cingulate cortex, a region of the brain that plays a role in emotion, ...
  7. Spine Spine
    Spine: 1) The column of bone known as the vertebral column, which surrounds and protects the spinal cord. The spine can be categorized according to level of the body: i.e., cervical spine (neck), thoracic spine (upper and middle back), and lumbar spine (lower back). See also vertebral column. 2...
  8. Spine, slipped Spine, slipped
    Spine, slipped: See: Spondylolisthesis....
  9. Spinocerebellar Spinocerebellar
    Spinocerebellar: Pertaining to the spinal cord and the cerebellum, as in spinocerebellar ataxia (ataxia with cerebellar malfunction)....
  10. Spinocerebellar ataxia Spinocerebellar ataxia
    Spinocerebellar ataxia: Ataxia with malfunction of the cerebellum....
  11. Spinous process Spinous process
    Spinous process: A slender projection from the back of a vertebra to which muscles and ligaments are attached....
  12. Spiral CAT scan Spiral CAT scan
    Spiral CAT scan: A conventional computerized axial tomography scan (CAT scan or CT scan) is an x-ray procedure which combines many x-ray images with the aid of a computer to generate cross-sectional views and, if needed, three-dimensional images of the internal organs and structures of the body. A ...
  13. Spiral fracture Spiral fracture
    Spiral fracture: A fracture, sometimes called a torsion fracture, in which a bone has been twisted apart. ...
  14. Spirochete Spirochete
    Spirochete: A microscopic bacterial organism in the Spirochaeta family. Spirochetes have a worm-like, spiral-shaped form, and wiggle vigorously when viewed under a microscope. Treponema pallidum, the cause of syphilis, is a particularly well-known member spirochete....
  15. Spirometry Spirometry
    Spirometry: A test of the air capacity of the lung. The test utilizes a machine called a spirometer to measure the volume of air inspired and expired by the lungs....