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line (lin) 1. a stripe, streak, or narrow ridge. 2. an imaginary line connecting different anatomic landmarks.lin´ear absorption lines dark lines in the spectrum due to absorption of light by the substance through which the light has passed. anocutaneous line pectinate l. Beau's lines transverse furrows on the fingernails, usually a sign of a systemic disease but also due to other causes. bismuth line a thin blue-black line along the gingival margin in bismuth poisoning. blood line a line of direct descent through several generations. cement line a line visible in microscopic examination of bone in cross section, marking the boundary of an osteon (haversian system). cervical line anatomical designation for the cementoenamel junction, the dividing line between the crown and root portions of a tooth. cleavage lines linear clefts in the skin indicative of direction of the fibers. ) Anterior (A) and posterior (B) views of cleavage lines of the skin. costoclavicular line parasternal l. line of Douglas a crescentic line marking the termination of the posterior layer of the sheath of the rectus abdominis muscle. epiphyseal line 1. a plane or plate on a long bone, visible as a line, marking the junction of the epiphysis and diaphysis. 2. a strip of lesser density on the radiograph of a long bone, representing that plane or plate. lines of expression the natural skin lines and creases of the face and neck; the preferred lines of incision in facial and cervical surgery. gingival line 1. a line determined by the level to which the gingiva extends on a tooth. 2. any linear mark visible on the surface of the gingiva. gluteal line any of the three rough curved lines (anterior, inferior, and posterior) on the gluteal surface of the ala of the ilium. Harris lines lines of retarded growth seen radiographically at the epiphyses of long bones. hot line see under H. iliopectineal line a ridge on the ilium and pubes showing the brim of the true pelvis. intertrochanteric line a line running obliquely from the greater to the lesser trochanter on the anterior surface of the femur. lead line a gray or bluish black line at the gingival margin in lead poisoning. mammary line see under ridge. mammillary line an imaginary vertical line passing through the center of the nipple. median line an imaginary line dividing the body surface equally into right and left sides. milk line mammary ridge. mylohyoid line a ridge on the inner surface of the lower jaw from the base of the symphysis to the ascending rami behind the last molar tooth. nasobasilar line one through the basion and nasion. Nélaton's line one from the anterior superior spine of the ilium to the most prominent part of the tuberosity of the ischium. nuchal lines three lines (inferior, superior, highest) on the outer surface of the occipital bone; see also external occipital crest. parasternal line an imaginary line midway between the mammillary line and the border of the sternum. pectinate line one marking the junction of the zone of the anal canal lined with stratified squamous epithelium and the zone lined with columnar epithelium. pectineal line 1. a line running down the posterior surface of the shaft of the femur, giving attachment to the pectineus muscle. 2. the anterior border of the superior ramus of the pubis. semilunar line a curved line along the lateral border of each rectus abdominis muscle, marking the meeting of the aponeuroses of the internal oblique and transverse abdominal muscles. Shenton's line a curved line seen in radiographs of the normal hip, formed by the top of the obturator foramen. sternal line an imaginary vertical line on the anterior body surface, corresponding to the lateral border of the sternum. subcostal line a transverse line on the surface of the abdomen at the level of the lower edge of the tenth costal cartilage. Sydney line a palmar crease correlated with an increased risk for leukemia and other malignancies in childhood. temporal line 1. either of the curved ridges, inferior and superior, on the outside of the parietal bone, continuous with the temporal line of the frontal bone. 2. a ridge extending superiorly and posteriorly from the zygomatic process of the frontal bone. ) terminal line of pelvis one on the inner surface of each pelvic bone, from the sacroiliac joint to the iliopubic eminence anteriorly, separating the false from the true pelvis. trapezoid line a ridge on the inferior surface of the clavicle for attachment of the trapezoid ligament. Voigt's line a dorsoventral pigmented line of demarcation on the skin along the lateral edge of the biceps muscle; seen in 20 to 26 per cent of blacks and rarely in whites.
line, n a boundary; demarcation. line angle, n See angle, line. line, basophilic, n a group of microscopic sections of bone that stains darkly with hematoxylin. Represents periods of bone inactivity. line, Camper's, n.pr the line running from the inferior border of the ala of the nose to the superior border of the tragus of the ear. line, cement, n the line of cement exposed at the margin of an inlay or crown. line, cementing, n a basophilic line distinguishing adjacent lamellae of bone; represents periods of inactivity of bone formation and resorption. line, cervical, n See junction, cementoenamel. line, cross arch fulcrum, n See line, fulcrum, cross arch. line, external oblique, n a ridge of osseous structure on the body of the mandible extending from the anterolateral border to the mandibular ramus, passing downward and forward, after covering the buccocervical portion of the mandibular third molar, and ending by blending into the molar teeth. line, finish, n in cavity preparations, a minimal line of demarcation of the wall of the preparation at the cavosurface angle; usually results from a slice made by an abrasive disk. line focus, n a principle employed in the design of radiographic tubes, by which the effective focal spot is sharply reduced relative to the actual (larger) focal spot desirable to deal with the heat generated. It involves focusing the cathode stream, in the pattern of a thin rectangle, onto an anode truncated at about 20° to the transverse axis of the tube. See also spot, focal, effective. line, fulcrum, n an imaginary line around which a removable partial denture tends to rotate. line, fulcrum, anteroposterior, n an imaginary line of rotation extending through the rest and other support areas along the same side of a removable partial denture. line, fulcrum, cross arch, n an imaginary line through the tooth-supported rest areas nearest to soft tissue-supported areas and around which the partial denture will tend to rotate when forces are applied to the soft tissue-supported areas. line, lead, n a bluish-black patch on the gingival tissues, usually about 1 mm from the gingival crest. Caused by the deposition of fine granules of lead sulfide in the tissues. A sign of lead absorption in lead poisoning (plumbism). line, median, n the intersection of the midsagittal plane with the maxillary and mandibular dental arches. The center line divides the central body surface into right and left. line, mercurial, n a linear area of abnormal pigmentation of the gingival tissues associated with mercury poisoning. Seen along the gingival margin, it has been variously described as bluish, brownish, dirty reddish, or purplish in coloration. line, neonatal, n the microscopic imbrication line on a primary tooth marking the point at which prenatal growth stops and postnatal growth begins. See line, Owen contour. line of credit, n an arrangement whereby a financial institution (bank or insurance company) commits itself to lend up to a specified maximum amount of funds during a specified period. The interest rate on the loan may be specified or not. Sometimes a commitment fee is imposed for obtaining the line of credit. line of draw, n the direction or plane of withdrawal or seating of a removable or cemented restoration. line of force, n See force, line of. line of occlusion, n the alignment of the occluding surfaces of the teeth in the horizontal plane. See also plane, occlusal line. line of Retzius, n.pr one of several microscopic incremental lines appearing in the mature enamel. line, Owen contour, n.pr one of a series of adjoining microscopic imbrication lines in dentin that demonstates a disturbance in body metabolism. See line, neonatal. line, petrous (pet´r  s), n the line traced around the hard, dense portion of temporal bone that forms a case protecting the inner ear. line printer, n a fast printing device. A line printer prints on paper each line of characters in one operation, rather than character by character. line, protrusive, n one of the three tracings made on each of the six projection planes of a jaw motion data recorder. line, survey, n a line produced on the various portions of a dental cast by a surveyor, scriber, or marker. It designates the greatest height of contour in relation to the orientation of the cast to the vertical scriber. line, vibrating, n the imaginary line across the posterior part of the palate marking the division between the movable and relatively immovable tissues of the palate. line 1. a stripe, streak, mark, or narrow ridge; often an imaginary line connecting different landmarks. See also linea. 2. conversion of a broad beam of x-rays to a pencil beam. 3. a single consignment of livestock from one farm. Said of a group of cattle or sheep notable for their homogeneity. absorption l's dark lines in the spectrum due to absorption of light by the substance through which the light has passed. line block a nerve block of local anesthesia produced by infiltrating the anesthetic along a line that the incision is to take. blue line lead line (below). cell line see cell culture. cement line a line visible in microscopic examination of bone in cross section, marking the boundary of an osteon (haversian system). cervical line cleavage l's linear clefts in the skin indicative of direction of the fibers. line dressing a system of handling carcasses in an abattoir. The carcasses move along an overhead chain line past a series of stations where the dressing and meat inspection is done. line focus utilization of a broad beam of electrons for the generation of x-rays by a rotating anode so that the area of the target on which the electrons fall is spread over a line instead of a point. gingival line 1. a line determined by the level to which the gingiva extends on a tooth; called also gum line. 2. any linear mark visible on the surface of the gingiva. gum line gingival line (1). iliopectineal line the ridge on the ilium and pubes showing the brim of the true pelvis. incremental l's lines supposedly showing the successive layers deposited in a tissue, as in the tooth enamel. intertrochanteric line one running obliquely from the greater to the lesser trochanter. lead line a bluish line at the edge of the gums in lead poisoning. Rarely seen in animals. median line an imaginary vertical line dividing the body equally into right and left parts. milk line 1. the line of thickened epithelium in the embryo along which the mammary glands are developed. 2. the metal tube in a milking machine along which the milk, after extraction from the cow, passes to the storage vat. mylohyoid line a ridge on the inner surface of the lower jaw from the base of the symphysis to the ascending rami behind the last molar tooth. pectinate line one marking the junction of the zone of the anal canal lined with stratified squamous epithelium and the zone lined with columnar epithelium. physeal line one on the surface of an adult long bone, marking the junction of the epiphysis and diaphysis. pleural reflection line line of the junction between costal and diaphragmatic pleurae. semilunar line a curved line along the lateral border of each rectus abdominis muscle, marking the meeting of the aponeuroses of the internal oblique and transverse abdominal muscles. temporal line a curved ridge on the external surface of the cranium that marks the origin of the temporal muscle. terminal line one on the inner surface of each pelvic bone, from the sacroiliac joint to the iliopubic eminence cranially, separating the false from the true pelvis, and marking the pelvic inlet. line transects a technique for estimating the density of a population, e.g. the number of deer per hectare in a gamepark. visual line a line from the point of vision of the retina to the object of vision; called also visual axis. |
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