Cranial Index definition of Cranial Index in the Free Online Encyclopedia.

cranial index: see cephalic index cephalic index [Gr. kephale=head], ratio of the breadth of the head to its length. Expressed as a percental number, it provides the simplest description of the geometric relation of two dimensions.
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cranial index [′krān·ē·əl ′in‚deks]

(anthropology)

The ratio of maximum skull height to maximum skull breadth multiplied by 100.

Cranial Index

the ratio of the maximum breadth of the skull (transverse diameter) to its maximum length (longitudinal diameter) expressed as a percent. The cranial index is used in anthropology to characterize the shape of the skull in the horizontal plane. Low values reflect a relatively long and narrow skull. An index not greater than 74.9 is indicative of dolichocrany, whereas indexes of 75–79.9 and 80 or greater reflect mesocrany and bradycrany, respectively. The cranial index of humans does not reflect intellectual capacity. The index is used as a means of distinguishing anthropological racial types from skeletons.

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"I suppose you are aware," said he, checking off points upon his fingers, "that the cranial index is a constant factor?

The Lost World by Doyle, Sir Arthur Conan View in context

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