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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 anatomical 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 b.'s the dark-staining anisotropic cross striations in the myofibrils of muscle fibers, comprising regions of overlapping thick (myosin) and thin (actin) filaments.A disks, anisotropic disks, Q b.'s (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., lambdamax).
amniotic b.'s strands of amniotic tissue adherent to the embryo or fetus; they may cause constriction of embryonic limbs. See also congenital amputation.amniotic adhesions, annular b., constriction ring (2), Simonart's b.'s (1), Simonart's ligaments, Simonart's threads, Streeter's b.'s;
annular b. amniotic b.'s
anogenital b. the first indication of the perineum in the embryo.
atrioventricular b. atrioventricular bundle
Baillarger's b.'s Baillarger's lines, under line
b. bands Muerhrcke's sign
Bechterew's b. b. of Kaes-Bechterew
Broca's diagonal b. a white fiber bundle descending in the precommissural septum toward the base of the forebrain, immediately rostral to the lamina terminalis; 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.
chromosome b. a region of darker or contrasting staining across the width of a chromosome; the pattern of b.'s is characteristic for most chromosomes. See banding.
Clado's b. the suspensory ligament of the ovary.
b.'s of colon 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. in the fibers which are then incapable of contracting again.contraction band necrosis;
coronary b. a region of the pododerm; a prominent ridge of corium and underlying tela subcutanea at the top of the hoof from which most of the wall of the hoof grows.corium coronae;
Essick's cell b.'s groups of cells in the developing rhombencephalon which migrate in two b.'s, one of which eventually forms the inferior olivary nucleus and the arcuate nucleus, and the other the pontine nuclei.
Gennari's b. line of Gennari
b. of Giacomini 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.H disk, Hensen's disk, Hensen's line;
His' b. atrioventricular bundle
Hunter-Schreger b.'s 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.Hunter-Schreger lines, Schreger's 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.I disk, isotropic disk;
iliotibial b. iliotibial tract
b. of Kaes-Bechterew b. of horizontal myelinated fibers in the most superficial part of the third layer of the isocortex.Bechterew's b., layer of Bechterew, line of Bechterew, line of Kaes;
Ladd's b. a peritoneal attachment of an incompletely rotated cecum, causing obstruction of the duodenum, found in malrotation of the intestine.
Lane's b. a congenital b. on the distal ileum causing stasis.Lane's kink;
longitudinal b.'s of cruciform ligament ligamentous slips forming the "upright" or vertical beam of the cruciform ligament.fasciculi longitudinales ligamenti cruciformis atlantis [NA];
M b. M line
Mach's b. a relatively bright or dark b. perceived in a zone where the luminance increases or decreases rapidly.
Maissiat's b. 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's 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.Meckel's ligament;
moderator b. septomarginal trabecula
oligoclonal b. small discrete b.'s in the gamma globulin region of the spinal fluid electrophoresis, indicating local central nervous system production of IgG; b.'s 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.
perioplic b. a narrow b. of corium and underlying tela subcutanea proximal to the coronary b. at the top of the hoof; the periople develops from it.
Q b.'s 1. A b.'s 2. See Q-banding stain.
Reil's b. 1. septomarginal trabecula 2. medial lemniscus
silastic b. (si´las-tik) a small silastic ring placed around each fallopian tube to achieve permanent sterilization.
Simonart's b.'s 1. amniotic b.'s 2. weblike band 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.
Streeter's b.'s amniotic b.'s
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.b. of Giacomini, cauda fasciae dentatae, frenulum of Giacomini, tail of dentate gyrus;
ventricular b. of larynx vestibular fold
Z b. Z line
zonular b. zona orbicularis
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