line (līn)
line [līn]
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.
| pectinate line n. See anocutaneous line. |
line [līn]
1. a stripe, streak, or narrow ridge; sometimes only an imaginary connector between two anatomic landmarks. Called also linea. adj., adj lin´ear.
2. tubing on a catheter.
absorption l's dark lines in the spectrum due to absorption of light by the substance through which the light has passed.
arterial line a monitoring system that uses an artery for access and consists of a catheter in the artery, pressure tubing, a transducer, and an electronic monitoring device. The most common uses of arterial lines are for monitoring of systemic blood pressure and obtaining arterial blood for analysis.
Beau's l's transverse lines or grooves in the nail plate caused by various systemic and local traumatic factors.
Beau's line. From Polaski and Tatro, 1996.
bismuth line a thin blue-black line along the gingival margin in bismuth poisoning.
blue line lead line.
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.
cleavage l's Langer's lines.
line of Douglas a crescentic line marking the termination of the posterior layer of the sheath of the rectus abdominis muscle.
l's of election lines of expression.
epiphyseal line one on the surface of an adult long bone, marking the junction of the epiphysis and diaphysis.
l's 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; called also gum line.
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.
gum line gingival line (def. 1).
hot line see hot line.
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 on the anterior surface of the femur.
Langer's l's linear clefts in the skin indicative of the direction of the fibers; they correspond closely to the creases of the body but vary with body configuration. Lines of incision made parallel to them are thought to heal more efficiently. Called also cleavage lines.
lead line a purple-blue line at the edge of the gums in chronic lead poisoning; called also blue line.
lip line a line on the teeth at the level to which the margin of either lip extends.
median line an imaginary vertical line dividing the body equally into right and left parts.
milk line the line of thickened epithelium in the embryo along which the mammary glands are developed.
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.
nuchal l's three lines (inferior, superior, and highest) on the outer surface of the occipital bone.
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.
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; it is used to determine the relationship between the head of the femur and the acetabulum.
temporal l's curved ridges, inferior and superior, on the external surface of the parietal bone, continuous with the temporal line of the frontal bone, a ridge that extends upward and backward from the zygomatic process of the frontal bone.
terminal line 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.
visual line a line from the point of vision of the retina to the object of vision; called also visual axis.
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.
pectinate
comb-shaped.
imperforate pectinate ligament
a cause of primary glaucoma; considered to be an inherited defect in a number of breeds of dogs. See also pectinate ligament (below).
pectinate ligament
the comb-like trabeculae of the corneo-iridial angle.
pectinate line
see pectinate line.
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