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A band |
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band (band)
1. a part, structure, or appliance that binds; for anatomical structures, see frenulum, tenia, trabecula, and vinculum. 2. in dentistry, a thin metal strip fitted around a tooth or its roots. 3. in histology, a zone of a myofibril of striated muscle. 4. in cytogenetics, a segment of a chromosome stained brighter or darker than the adjacent bands; used in identifying the chromosomes and in determining the exact extent of chromosomal abnormalities. Called Q-b's, G-b's, C-b's, T-b's, etc., according to the staining method used. band of Broca a band of nerve fibers that forms the caudal zone of the anterior perforated substance where it adjoins the optic tract. I band the band within a striated myofibril, seen as a light region under the light microscope and as a dark region under polarized light. iliotibial band see under tract. M band the narrow dark band in the center of the H band. matrix band a thin piece of metal fitted around a tooth to supply a missing wall of a multisurface cavity to allow adequate condensation of amalgam into the cavity. oligoclonal bands discrete bands of immunoglobulins with decreased electrophoretic mobility whose presence in the cerebrospinal fluid may be indicative of multiple sclerosis or other disease of the central nervous system. Z band a thin membrane in a myofibril, seen on longitudinal section as a dark line in the center of the I band; the distance between Z bands delimits the sarcomeres of striated muscle.
A band, the area between two I bands of a sarcomere, marked by partial overlapping of actin and myosin filaments and appearing dark. Compare I band. band [band] 1. a part, structure, or appliance that binds; for anatomical structures, see frenulum, tenia, trabecula, and vinculum. 2. in dentistry, a thin metal strip fitted around a tooth or its roots. 3. in histology, a zone of a myofibril of striated muscle. 4. in cytogenetics, a segment of a chromosome stained brighter or darker than the adjacent bands; used in identifying the chromosomes and in determining the exact extent of chromosomal abnormalities. Called Q-bands, G-bands, C-bands, T-bands, etc., according to the staining method used. See also layer, stria, and stripe. I band the band within a striated myofibril, seen as a light region under the light microscope and as a dark region under polarized light. M band the narrow dark band in the center of the H band. matrix band a cylindrical metal band with a special clamp or holder (the matrix retainer); it is filled with softened impression compound and seated over a tooth so that the compound flows into the prepared cavity and an impression of the tooth can be obtained. It is also used for placement and contouring of certain restorative materials. orthodontic band a band fitted over a tooth to anchor an orthodontic fixed appliance. Z band a thin membrane in a myofibril, seen on longitudinal section as a dark line in the center of the I band; the distance between Z bands delimits the sarcomeres of striated muscle. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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