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From Embryology
Tubal Pregnancy
An Ectopic pregnancy occurs where the zygote implants outside of the uterine cavity. This occurs in 1-2% of pregnancies, 98% of which are tubal (implantation in the uterine (fallopian) tube). Figure 2 demonstrates other sites of ectopic implantation.
http://informahealthcare.com.wwwproxy0.library.unsw.edu.au/doi/pdf/10.3109/17453054.2012.747177 - Fig 2
[(1)] Gauthier, A. (2012). Ectopic tubal pregnancy. Journal of Visual Communication in Medicine, 35(4), 174. doi: http://dx.doi.org/10.3109/17453054.2012.747177