Displacement of the ovaries
The ovaries are also moved slightly - from the location where they are engendered in the middle of the abdomen to the pelvis. This migration results partially from the massive growth of the upper abdominal region in comparison with the pelvic area.
The influence of the lower gubernaculum in this process is not entirely clear.
The mesonephros atrophies in the 7th week. Only the ovary with its mesovarium medially and the paramesonephric duct (later fallopian tube) with the mesosalpinx lateral to the meso of the original urogenital tract remain. They are connected with the dorsal abdominal wall of the embryo via the meso of the original urogenital tract.
Through atrophy of the mesonephros the upper gubernaculum connects the ovary directly with the upper rear body wall and becomes designated as the suspensory ligament of ovary.
The lower gubernaculum has its origin in the bottom side of the ovary and forms the ovarian ligament and, further down, the round ligament of uterus that reaches the genital swelling (labia majora) through the inguinal canal..
The nephrogenic cord is originally vertical. The fallopian tube, which forms from the upper part of the paramesonephric duct (Müller), finally takes on a horizontal position in that it is drawn medially by the joining of the lower part of the paramesonephric duct (Müller) as the uterus is being formed.
The ovary, which initially lies medially to the fallopian tube (paramesonephric duct) in front of the atrophying mesonephros, slides backwards as a result.
The peritoneal mesos passively follow these movements. Finally the broad ligament of uterus forms with three sections:
- Upper section: mesosalpinx with the fallopian tube
- Ventral section: mesometrium with the round ligament of uterus
- Dorsal section: mesovarium with the ovarian ligament