Schreger line (original) (raw)
Schreger lines are visual artifacts that are evident in the cross-sections of ivory. They are commonly referred to as cross-hatchings, engine turnings, or stacked chevrons. Schreger lines can be divided into two categories. The easily seen lines which are closest to the cementum are the outer Schreger lines. The faintly discernible lines found around the or are the inner Schreger lines. The intersections of Schreger lines form angles, which appear in two forms: and . Concave angles have slightly concave sides and open to the medial (inner) area of the tusk. Convex angles have somewhat convex sides and open to the lateral (outer) area of the tusk. Outer Schreger angles, both concave and convex, are acute in extinct proboscidea and obtuse in extant proboscidea.
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| dbo:abstract | Schreger lines are visual artifacts that are evident in the cross-sections of ivory. They are commonly referred to as cross-hatchings, engine turnings, or stacked chevrons. Schreger lines can be divided into two categories. The easily seen lines which are closest to the cementum are the outer Schreger lines. The faintly discernible lines found around the or are the inner Schreger lines. The intersections of Schreger lines form angles, which appear in two forms: and . Concave angles have slightly concave sides and open to the medial (inner) area of the tusk. Convex angles have somewhat convex sides and open to the lateral (outer) area of the tusk. Outer Schreger angles, both concave and convex, are acute in extinct proboscidea and obtuse in extant proboscidea. (en) Le linee di Schreger sono artefatti visivi che si evidenziano nelle sezioni dell'avorio. Comunemente ci si riferisce ad essi con i termini: "tratti incrociati" (cross-hatchings), fiorettatura (engine turnings) o galloni impilati (stacked chevrons). Le linee di Schreger possono essere divise in due categorie. Le linee facilmente visibili che sono più prossime al cemento sono le linee di Schreger esterne. Le linee debolmente distinguibili che si trovano attorno al nervo della zanna o alle cavità della polpa sono le linee di Schreger interne. Le intersezioni delle linee di Schreger formano angoli che appaiono in due forme: angoli concavi e angoli convessi. Gli angoli concavi presentano lati leggermente concavi e si aprono verso l'area mediana (interna) della zanna. Gli angoli convessi presentano lati alquanto convessi e aperti verso l'area laterale (esterna) della zanna. Gli angoli di Schreger esterni, sia concavi sia convessi, sono acuti nei proboscidea estinti e ottusi nei proboscidea tuttora esistenti. (it) Les lignes de Schreger sont des artefacts visuels visibles dans les coupes transversales d'ivoire. Les lignes de Schreger peuvent être divisées en deux catégories. Les lignes facilement visibles à l’œil nu sont les lignes externes. Les lignes plus difficilement perceptibles autour du nerf de la défense sont les lignes internes. Les intersections des lignes de Schreger forment des angles, qui apparaissent sous deux formes : des angles concaves et des angles convexes. Les angles concaves ont des côtés légèrement concaves et ouverts vers la partie interne de la défense. Les angles convexes ont des côtés ouverts vers la partie externes de la défense. Les angles de Schreger externes concaves comme convexes, sont aigus chez les proboscidea éteints, et obtus chez les proboscidea existant. (fr) |
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| gold:hypernym | dbr:Artifacts |
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| rdfs:comment | Schreger lines are visual artifacts that are evident in the cross-sections of ivory. They are commonly referred to as cross-hatchings, engine turnings, or stacked chevrons. Schreger lines can be divided into two categories. The easily seen lines which are closest to the cementum are the outer Schreger lines. The faintly discernible lines found around the or are the inner Schreger lines. The intersections of Schreger lines form angles, which appear in two forms: and . Concave angles have slightly concave sides and open to the medial (inner) area of the tusk. Convex angles have somewhat convex sides and open to the lateral (outer) area of the tusk. Outer Schreger angles, both concave and convex, are acute in extinct proboscidea and obtuse in extant proboscidea. (en) Les lignes de Schreger sont des artefacts visuels visibles dans les coupes transversales d'ivoire. Les lignes de Schreger peuvent être divisées en deux catégories. Les lignes facilement visibles à l’œil nu sont les lignes externes. Les lignes plus difficilement perceptibles autour du nerf de la défense sont les lignes internes. Les intersections des lignes de Schreger forment des angles, qui apparaissent sous deux formes : des angles concaves et des angles convexes. Les angles concaves ont des côtés légèrement concaves et ouverts vers la partie interne de la défense. Les angles convexes ont des côtés ouverts vers la partie externes de la défense. Les angles de Schreger externes concaves comme convexes, sont aigus chez les proboscidea éteints, et obtus chez les proboscidea existant. (fr) Le linee di Schreger sono artefatti visivi che si evidenziano nelle sezioni dell'avorio. Comunemente ci si riferisce ad essi con i termini: "tratti incrociati" (cross-hatchings), fiorettatura (engine turnings) o galloni impilati (stacked chevrons). Le linee di Schreger possono essere divise in due categorie. Le linee facilmente visibili che sono più prossime al cemento sono le linee di Schreger esterne. Le linee debolmente distinguibili che si trovano attorno al nervo della zanna o alle cavità della polpa sono le linee di Schreger interne. (it) |
| rdfs:label | Lignes de Schreger (fr) Linee di Schreger (it) Schreger line (en) |
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| is foaf:primaryTopic of | wikipedia-en:Schreger_line |
