Mindblown: a blog about philosophy.
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Line of demarcation
A line of division between healthy and diseased tissue. Visible line separating colored hair from new growth, an obvious line where foundation starts or stops.
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Cervical line
A line of junction of cementum and enamel of a tooth.
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Cement line
The refractile boundary of an osteon in compact bone.
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Canthomeatal line
An imaginary line extending from the canthus of the eye to the center of the external auditory meatus.
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Base line
The line from the infraorbital ridge through the middle of the external auditory meatus to midline of occiput.
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Axillary line
Anterior, posterior, and midaxillary lines that extend downward from the axilla.
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Axial line
A line running in the main axis of the body or some part of it. The axial line of the hand runs through the middle digit; the axial line of the foot runs through the second digit.
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Arterial line
A hemodynamic monitoring system consisting of a catheter in an artery connected to pressure tubing, a transducer, and an electronic monitor. It is used to measure systemic blood pressure and to provide ease of access for the drawing of blood (e.g., in intensive care, when regular monitoring of blood gases is necessary).
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Ala-tragus line
An imaginary line that extends from the ala of the nose to the tragus of the ear. The line is an estimated point of entry for intraoral dental radiographs of the maxilla and is also used in denture prosthodontics.
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Abdominal line
Arbitrary lines delineating abdominal regions.
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