Figure 1: Gross morphology of the oviduct at the undifferentiated stage. Figure 1A: The undifferentiated left oviduct (Ov) of quail at day of hatching lies ventral to the left kidney (K). It appears apart and lateral to the left ovary (O). Its average length is about 1.5 cm. Gi: Gizzard; i: Intestine; L: Liver; Pr: Proventriculus; R: Rectum. Figure 1B: The oviduct at 10-day extends lateral to the left ovary (O) till the cloaca (cl) and ventral to the left kidney (K). It is divided into three parts; cranial (cr), middle (mi) and caudal (ca) parts. du: Duodenum; Pr: Proventriculus; R: Rectum. Figure 1C: The duct at 10- days is about 2.7 cm in length. The caudal part (ca) appears slightly enlarged and darker in color. cl: Cloaca; O: Ovary. Figure 1D: Showing more developed parts of the oviduct at 20- days. The duct is about 4 cm in length. cl: Cloaca; O: Ovary; R: Rectum.