Fig. 6

Transabdominal ultrasound with the sagittal images demonstrating. Ultrasound image of the normal endometrium in a 14-week-old rat prior to pregnancy (a) and ultrasound images of the same rat during early, mid, and late stages of pregnancy, respectively (b, c, d). Annotations: GS (Gestational sac), SK (Skull), SP (Spine), AD (Abdomen), UC (Umbilical Cord).