band

1. Any appliance or part of an apparatus that encircles or binds a part of the body. SEE ALSO: zone. 2. Any ribbon-shaped or cordlike anatomic structure that encircles or binds another structure or that connects two or more parts. See fascia, line, linea, stripe, stria, tenia. 3. A narrow strip containing one or more macromolecules (on occasions, small molecules) detected in electrophoresis or certain types of chromatography.

- A bands the dark-staining anisotropic cross striations in the myofibrils of muscle fibers, comprising regions of overlapping thick (myosin) and thin (actin) filaments. SYN: A disks, anisotropic disks, Q bands (1), Q disks.

- absorption b. the range of wavelengths or frequencies in the electromagnetic spectrum where radiant energy is absorbed by passage through a gaseous, liquid, or dissolved substance; it is exploited for analytical purposes in colorimetry or spectrophotometry, and is usually described in terms of the wavelength where maximum absorbance occurs ( i.e., λ_max).

- amnionic b. [MIM*217100] strands of amnion following its rupture, which can wrap around limbs, digits, face, and internal organs, causing constriction and amputation; the genetics of which is unclear. SEE ALSO: congenital amputation. SYN: amnionic adhesions, amnionic b. syndrome, anular b., constriction ring (2), Simonart bands (1), Simonart ligaments.

- anogenital b. the first indication of the perineum in the embryo.

- anular b. SYN: amnionic b..

- atrioventricular b. SYN: atrioventricular bundle.

- Baillarger bands SYN: Baillarger lines, under line.

- Bechterew b. SYN: b. of Kaes-Bechterew.

- Broca diagonal b. a white fiber bundle descending in the precommissural septum toward the base of the forebrain, immediately rostral to the lamina terminalis; this b. consists of a horizontal limb [TA] (crus horizontale [TA]), a vertical limb [TA] (crus verticale [TA]) and the cells associated with the b. form the nucleus of diagonal b. [TA] (nucleus striae diagonalis [TA]); at the base, the bundle turns in the caudolateral direction; traveling through a ventral stratum of the innominate substance alongside the optic tract, it fades before reaching the amygdala. SYN: diagonal b. [TA], stria diagonalis [TA].

- chromosome b. a region of darker or contrasting staining across the width of a chromosome; the pattern of bands is characteristic for most chromosomes. See banding.

- Clado b. SYN: suspensory ligament of ovary.

- bands of colon SYN: teniae coli, under tenia.

- contraction b. a microscopic change in myocardial cells in which excessive contraction, associated with elevated intracellular calcium and serum norepinephrine, causes the formation of transverse amorphous b.'s in the fibers which are then incapable of contracting again. SYN: contraction b. necrosis.

- diagonal b. [TA] SYN: Broca diagonal b..

- Essick cell bands groups of cells in the developing rhombencephalon which migrate in two bands, one of which eventually forms the inferior olivary nucleus and the arcuate nucleus, and the other the pontine nuclei.

- Gennari b. SYN: line of Gennari.

- b. of Giacomini SYN: uncus b. of Giacomini.

- H b. the paler area in the center of the A b. of a striated muscle fiber, comprising the central portion of thick (myosin) filaments that are not overlapped by thin (actin) filaments. SYN: H disk, Hensen disk, Hensen line.

- His b. SYN: atrioventricular bundle.

- Hunter-Schreger bands alternating light and dark lines seen in dental enamel that begin at the dentoenamel junction and end before they reach the enamel surface; they represent areas of enamel rods cut in cross-sections dispersed between areas of rods cut longitudinally. SYN: Hunter-Schreger lines, Schreger lines.

- I b. a light b. on each side of the Z line of striated muscle fibers, comprising a region of the sarcomere where thin (actin) filaments are not overlapped by thick (myosin) filaments. SYN: I disk, isotropic disk.

- iliotibial b. SYN: iliotibial tract.

- b. of Kaes-Bechterew b. of horizontal myelinated fibers in the most superficial part of the third layer of the isocortex. SYN: stria laminae molecularis [TA], stria of molecular layer [TA], Bechterew b., layer of Bechterew, line of Bechterew, line of Kaes.

- Ladd b. a peritoneal attachment of an incompletely rotated cecum, found in malrotation of the intestine; may cause obstruction of the duodenum.

- Lane b. a congenital b. on the distal ileum that may extend into the right iliac fossa causing stasis. SYN: Lane kink.

- longitudinal bands of cruciform ligament of atlas [TA] ligamentous slips forming the “upright” or vertical beam of the cruciform ligament of the atlas. SYN: fasciculi longitudinales ligamenti cruciformis atlantis [TA].

- M b. SYN: M line.

- Mach b. a relatively bright or dark b. perceived in a zone where the luminance increases or decreases rapidly.

- Maissiat b. SYN: iliotibial tract.

- matrix b. a metal or plastic b. secured around the crown of a tooth to confine restorative material to be adapted into a prepared cavity.

- Meckel b. the portion of the anterior ligament of the malleus that extends from the base of the anterior process through the petrotympanic fissure, to attach to the spine of the sphenoid. See anterior ligament of malleus. SYN: Meckel ligament.

- moderator b. SYN: septomarginal trabecula.

- Muehrcke bands apparent leukonychia with white bands parallel to lanula of the nails, seen in hypoalbuminemia. SYN: Muehrcke sign.

- oligoclonal b. small discrete bands in the gamma globulin region of the spinal fluid electrophoresis, indicating local central nervous system production of IgG; bands are frequently seen in patients with multiple sclerosis but can also be found in other diseases of the central nervous system including syphilis, sarcoidosis, and chronic infection or inflammation.

- orthodontic b. a thin strip of metal closely adapted to the crown of a tooth to which wires may be attached for tooth movement.

- pecten b. a fibrous induration of the anal pecten resulting from passive congestion or a chronic form of inflammation in this region.

- Q bands 1. SYN: A bands. 2. See Q-banding stain.

- Reil b. 1. SYN: septomarginal trabecula. 2. SYN: medial lemniscus.

- silastic b. (si′las-tik) a small silastic ring placed around each fallopian tube to achieve permanent sterilization.

- Simonart bands 1. SYN: amnionic b.. 2. weblike b. of tissue partially filling the gap between the medial and lateral portions of a cleft lip.

- Soret b. the absorption b. of all porphyrins at about 400 nm.

- uncus b. of Giacomini a slender whitish b., the attenuated anterior continuation of the dentate gyrus (fascia dentata), crossing transversally the surface of the recurved part of the uncus gyri parahippocampalis. SYN: b. of Giacomini, cauda fasciae dentatae, frenulum of Giacomini, tail of dentate gyrus.

- ventricular b. of larynx SYN: vestibular fold.

- Z b. SYN: Z line.

- zonular b. SYN: zona orbicularis (articulationis coxae).

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band 'band n

1) a thin flat encircling strip esp. for binding: as

a) a strip of cloth used to protect a newborn baby's navel called also bellyband

b) a thin flat strip of metal that encircles a tooth <orthodontic \bands>

2) a strip separated by some characteristic color or texture or considered apart from what is adjacent: as

a) a stripe, streak, or other elongated mark on an animal esp one transverse to the long axis of the body

b) a line or streak of differentiated cells

c) one of the alternating dark and light segments of skeletal muscle fibers

d) BAND FORM

e) a strip of abnormal tissue either congenital or acquired esp a strip of connective tissue that causes obstruction of the bowel

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(band) 1. a strip that holds together or binds two or more separate objects or parts; for anatomical structures, see frenulum, taenia, trabecula, and vinculum. 2. an object or appliance that confines or restricts while allowing a limited degree of movement. 3. an elongated area with parallel or roughly parallel borders that is distinct from the surrounding surface by its color, texture, or other characteristics, such as a chromosome band. See also layer, stria, and stripe. 4. in dentistry, a thin metal hoop that horizontally encircles the crown or root of a natural tooth.