This material is from the 4th edition of The Zebrafish Book. The 5th edition is available in print and within the ZFIN Protocol Wiki.

Modified from: Kimmel et al., 1955. Developmental Dynamics 203:253-310. Copyright © 1995 Wiley-Liss, Inc. Reprinted only by permission of Wiley-Liss, a subsidiary of John Wiley & Sons, Inc.

Fig. 6. Diagrammatic animal polar views of the planes of the first 5 cleavages. The outer circle is the yolk, and the inner ellipse in A is the uncleaved blastodisc. B-F show successive cleavages, with odd numbered cleavages cutting the short axis of the blastodisc and even numbered ones cutting the long axis. From Kimmel et al. (1991).

Figure 6