ho·ri·zons (hə-riґzənz) numbered stages of human embryonic development defined by anatomical characteristics in order to circumvent individual uncertainties of age and variations of dimension from both natural and technical causes. Streeter outlined 23 horizons, each spanning 2 or 3 days, covering the 7-week period beginning with fertilization; they have been revised to the currently used Carnegie stages (q.v.).

Medical dictionary. 2011.

Игры ⚽ Поможем сделать НИР

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