The screen consists of three frames, a photographic frame on the left, a text frame on the upper right, and an orientation frame on the lower right.
The photographic frame contains a photomicrographic image of a cross section of a 3-4 mm frog embryo taken from a set of 336 serial cross sections. The photographs are numbered one to 37 out of a possible 37. The cross sectional photographs are presented with the dorsal surface of the embryo uppermost and ventral surface lowermost. The lateral surfaces of the embryo are located on the right and left. A "Next Section" button below the photograph allows you to click and move to the following photograph.
The largest frame on the screen is the text frame. This frame has a scroll bar on the right hand side of the frame that allows you to move text upward and downward. The text consists of descriptive paragraphs that begin with a title that gives the section number out of the total number of 336 sections that comprise the embryo. A listing of the major visible features occurring at this particular level of sectioning follows the section number. Clicking on the title will bring the corresponding photograph into the photographic screen.
The orientation frame is located on the lower right hand side of the screen. This frame contains a thumbnail size photomicrograph of a side view of a whole 3-4 mm frog embryo with a vertical line that indicates the level of sectioning of each cross sectional photograph. A button list, allows you to click and move to the next section, a previous section, the ZOO*3050 (Developmental Biology) index, or the main (Developmental Biology) index.
Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
Page revised: April 2012