SHEEP EMBRYO SECTIONS SHOWING DEVELOPMENT OF THE SECONDARY PALATE Figure 9a. 20 mm embryo Magnification x8  b. 25mm embryo Magnification x7 These sections are viewed from below. The pattern of palatal closure in sheep is slightly different from that seen in humans, i.e. it is not anterior - posterior. Click on the palatal area on either image above to see the photographs with labels.