H band(redirected from H disc)
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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
the paler area in the center of the A band of a striated muscle fiber, comprising the central portion of thick (myosin) filaments that are not overlapped by thin (actin) filaments.
Farlex Partner Medical Dictionary © Farlex 2012
The paler area in the center of the A band of a striated muscle fiber, comprising the central portion of thick (myosin) filaments that are not overlapped by thin (actin) filaments.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
Hensen,Victor, German anatomist and physiologist, 1835-1924.
Hensen canal - a short membranous tube passing from the lower end of a saccule to the cochlear duct of the membranous labyrinth. Synonym(s): Hensen duct; uniting duct
Hensen cell - one of the supporting cells in the organ of Corti.
Hensen disk - Synonym(s): Hensen line
Hensen duct - Synonym(s): Hensen canal
Hensen knot - a local thickening of the blastoderm at the cephalic end of the primitive streak of the embryo. Synonym(s): Hensen node; primitive node
Hensen line - the paler area in the center of the A band of a striated muscle fiber, comprising the central portion of thick filaments that are not overlapped by thin filaments. Synonym(s): H band; Hensen disk
Hensen node - Synonym(s): Hensen knot
Hensen stripe - a band on the undersurface of the membrana tectoria of the cochlear duct.
Medical Eponyms © Farlex 2012