Schizophrenia, childhood
The onset of schizophrenia before adulthood. This condition is very rare in young children, but occurs with more frequency in the teenage years. Autism was once known as childhood schizophrenia, but is a completely different disorder.
See also autism, childhood disintegrative disorder, schizophrenia.
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- Schizotypal personality disorder
A type of personality characterized by unusual patterns of speech and behavior and by social withdrawal. See also Asperger syndrome.
- Schmorl's node
An upward and downward protrusion (pushing into) of a spinal disk’s soft tissue into the bony tissue of the adjacent vertebrae. Schmorl’s nodes, which are common, especially with minor degeneration of the aging spine, are detectable via X-ray as spine abnormalities. Schmorl’s nodes are most common in the middle and lower spine. Schmorl’s nodes usually […]
- Schonlein-Henoch purpura
A form of blood vessel inflammation (vasculitis) that typically affects small arterial vessels (capillaries) in the skin, kidneys, and intestinal tract. The disease presents characteristically as a skin rash associated with joint inflammation (arthritis) and cramping pain in the abdomen. The rash is purpuric due to bleeding into the skin and there be hives and […]
- SA node
The SA node (SA stands for sinoatrial) is one of the major elements in the cardiac conduction system, the system that controls the heart rate. This stunningly designed system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating the heart to contract and pump blood. The SA node is the heart’s […]
- S1-S5 (sacral vertebrae)
The first sacral vertebra through the fifth sacral vertebra. There are 5 sacral vertebral bones. They are represented by the symbols S1 through S5. The sacral vertebrae are situated in the spinal column just below the lumbar vertebrae and right above the coccyx, which is the lowest segment of the vertebral column. The sacral vertebrae […]