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The medulla is the innermost layer of the hair shaft.This nearly invisible layer is the most soft and fragile, and serves as the pith or marrow of the hair. Some mammals don't have a medulla in their hair. The presence or absence of this layer and the characteristics of the medulla can aid taxonomists in identifying what taxa a hair comes from. Characteristics include whether the medulla contains air pockets as well as the histology of the medulla.

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  • نخاع (شعر) (ar)
  • Medulla (poil) (fr)
  • Medulla (hair) (en)
  • 毛干髓质 (zh)
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  • النخاع هو الطبقة الأعمق من جذع الشعرة. هذه الطبقة غير المرئية تقريبًا هي الأكثر نعومة وهشاشة، وتعمل بمثابة لب أو نخاع الشعر. لا يزال العلماء غير متأكدين من الدور الدقيق للنخاع، لكنهم يتوقعون أنه في الأساس امتداد أكثر بروزًا في الشعر غير الصبغي (الرمادي أو الأبيض). (ar)
  • Le medulla, appelé aussi moelle ou canal médullaire, est la couche interne de la tige pilaire située sous le cortex. Ce canal est un tube formé d'un tissu épithélial fusiforme constitué d'une colonne de cellules diffuses peu pigmentées et peu keratinisées. (fr)
  • 毛干髓质(英語:hair shaft medulla),简称毛髓质(英語:hair medulla),是毛干的最内层,几乎不可见,在脫色的毛发(灰色或白色)中更为突出。毛干髓质的确切功能目前仍未确定。 人类的毛干髓质不发达且较窄,占毛干直径的一半以下,常呈断续状;动物的毛干髓质一般较为发达且较宽,占毛干直径的一半以上,呈连续状。 (zh)
  • The medulla is the innermost layer of the hair shaft.This nearly invisible layer is the most soft and fragile, and serves as the pith or marrow of the hair. Some mammals don't have a medulla in their hair. The presence or absence of this layer and the characteristics of the medulla can aid taxonomists in identifying what taxa a hair comes from. Characteristics include whether the medulla contains air pockets as well as the histology of the medulla. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Gray945.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Hair_shaft_diagram.png
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  • النخاع هو الطبقة الأعمق من جذع الشعرة. هذه الطبقة غير المرئية تقريبًا هي الأكثر نعومة وهشاشة، وتعمل بمثابة لب أو نخاع الشعر. لا يزال العلماء غير متأكدين من الدور الدقيق للنخاع، لكنهم يتوقعون أنه في الأساس امتداد أكثر بروزًا في الشعر غير الصبغي (الرمادي أو الأبيض). (ar)
  • Le medulla, appelé aussi moelle ou canal médullaire, est la couche interne de la tige pilaire située sous le cortex. Ce canal est un tube formé d'un tissu épithélial fusiforme constitué d'une colonne de cellules diffuses peu pigmentées et peu keratinisées. (fr)
  • The medulla is the innermost layer of the hair shaft.This nearly invisible layer is the most soft and fragile, and serves as the pith or marrow of the hair. Some mammals don't have a medulla in their hair. The presence or absence of this layer and the characteristics of the medulla can aid taxonomists in identifying what taxa a hair comes from. Characteristics include whether the medulla contains air pockets as well as the histology of the medulla. Scientists are still uncertain about the exact role of the medulla, but they speculate that it is primarily an extension that is more prominent in depigmented (grey or white) hair. (en)
  • 毛干髓质(英語:hair shaft medulla),简称毛髓质(英語:hair medulla),是毛干的最内层,几乎不可见,在脫色的毛发(灰色或白色)中更为突出。毛干髓质的确切功能目前仍未确定。 人类的毛干髓质不发达且较窄,占毛干直径的一半以下,常呈断续状;动物的毛干髓质一般较为发达且较宽,占毛干直径的一半以上,呈连续状。 (zh)
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