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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.
a cross-striation bisecting the I band of striated muscle myofibrils and serving as the anchoring point of actin filaments at either end of the sarcomere.
See Z line.
A cross-striation bisecting the I band of striated muscle myofibrils and serving as the anchoring point of actin filaments at either end of the sarcomere.
Synonym(s): Z band.
Synonym(s): Z band.
Amici,Giovanni Battista, Italian physicist, 1786-1863.
Amici disk - thin membrane seen as a line which serves as delimiter of sarcomeres in striated muscle. Synonym(s): Amici striae; Z band
Amici striae - Synonym(s): Amici disk
Z band, Z line
a band of electrodense, noncontractile protein which runs across the muscle fiber and to which the myofibrils are attached.