Diastema

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diastema

[‚dī·ə′stē·mə]
(anatomy)
A space between two types of teeth, as between an incisor and premolar.
(cell and molecular biology)
Modified cytoplasm of the equatorial plane prior to cell division.

Diastema

 

an excessive interval or space between teeth in mammals, usually caused by reduction of part of the teeth. In most herbivorous animals the cuspids and sometimes the incisors are reduced. Similar diastemata occur in the upper and lower jaws of rodents, horses, kangaroos, and other animals. In ruminants, diastema occurs only in the lower jaw. In carnivores it takes place without reduction of teeth. One diastema occurs in front of the fangs of the upper jaw (providing space for the lower fangs), and another is behind the lower fangs (allowing room for the upper fangs during biting). In closing the jaws the fangs nest and form a solid closure, preventing lateral motion of the jaw and aiding in the holding of prey.

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The emergence of these developments is contemporaneous with the rise of diastematic notation.
The fourth essay returns to the Alleluia Dies sanctificavit, approaching first the early, adiastematic sources (thirteen are collated), and then the diastematic sources (twelve collated, with variants for many others listed).
A manuscript without shelfmark housed at the Benedictine convent of Santa Cruz de la Seros in Jaca, Spain, is the only antiphoner in diastematic Aquitanian neumes from twelfth-century Aragon and the only known manuscript from Santa Cruz de la Seros to survive.