gum line

gum line

n.

The position of the margin of the gum in relation to teeth in the dental arch.

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gum line.

See gingival line.

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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.

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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

see cemento-enamel junction.

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.