A Human Embryo of Streeter Age Group XIII

Abstract

Streeter (1942; 1945) introduced the concept of 'developmental horizon', which was based on the correlation between the embryonic age and the developmental status of the internal organs. Although there has been uncertainty about the age of embryos in some stages or horizons, his classification provides a major criteria in determining the age of embryo and is generally accepted at least in the early period of organogenesis. In this report, an embryo that belongs to age group XIII is described to complement a previous report of the same age group (Chi and Ham 1985) and to present additional findings.

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