1. Chorionic Villus Sampling
Joan S. Hogge, MS, W. Allen Hogge, MD, Mitchell S. Golbus, MD 
Journal of Obstetric, Gynecologic & Neonatal Nursing 
Volume 15, Issue 1, Pages (January 1986)
DOI: /j tb01363.x
Copyright © 1986 AWHONN, the Association of Women's Health, Obstetric and Neonatal Nurses Terms and Conditions

2. Figure 1
Diagram of the human embryo at approximately six weeks gestation. At the embryonic pole, the villi are numerous and well-formed; at the abembryonic pole, the villi are fewer in number and less well-developed.
Journal of Obstetric, Gynecologic & Neonatal Nursing  , 24-28DOI: ( /j tb01363.x)
Copyright © 1986 AWHONN, the Association of Women's Health, Obstetric and Neonatal Nurses Terms and Conditions

3. Figure 2
Diagram of the uterus at 10 weeks gestation with biopsy catheter in position.
Journal of Obstetric, Gynecologic & Neonatal Nursing  , 24-28DOI: ( /j tb01363.x)
Copyright © 1986 AWHONN, the Association of Women's Health, Obstetric and Neonatal Nurses Terms and Conditions