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On the side of the centrum of a dorsal vertebra, a cup-shaped depression to which the head of a rib is attached; if the ‘cup’ is incompletely hemispherical (i.e. ‘half a cup’) it is called a demi-facet or half-facet. A vertebra may have one or more facets or demi-facets.

Subjects: Zoology and Animal Sciences.

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