Synapsis

The side-by-side and point-by-point pairing of homologous chromosomes during meiosis.

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Synaptic cleft
The tiny space between two nerve cells across which the neurotransmitter acetylcholine diffuses.
Synaptonemal complex
SC protein-1 (SYCP1), SC protein-2 (SYCP2), and SC protein-3 (SYCP3). The SYCP1 gene is on chromosome 1p13; the SYCP2 gene is on chromosome 20q13.33; and the gene for SYCP3 is on chromosome 12q.
Syncephaly
Conjoined twins whose heads are joined together. From syn-, together + -cephaly, head = heads together. Also called craniopagus or janiceps.

Synchronic study
A study that is done at a single point in time rather than over the course of a period of time (longitudinally).
Syncope
Abnormal heart rhythms (heart beating too fast or too slow). Abnormalities of the heart valves (aortic stenosis or pulmonic valve stenosis). High blood pressure in the arteries supplying the lungs (pulmonary artery hypertension). Tears in the aorta (aortic dissection). Widespread disease of the heart muscle (cardiomyopathy). To be sure, many of the causes of temporary […]