From the adjacent mesonephros cords of cells grow into the attached part of the genital ridge, or testis, as it now is, and from these the rete testis is developed.
Recent research, however, points to these cords of the rete testis et ovarii as being derived from the coelomic epithelium instead of from the mesonephros.
Mesonephric cords appear as in the male; they do not enter the ovary, however, but form a transitory network (rete ovarii) in the mesovarium.
They formed a separate system (the Rete Sicula) until in 1906, like the rest of the railways of Italy, they passed into the hands of the state, with the exception of the line round Mount Etna and the line from Palermo to Corleone.
Front, showing the Rete or Spider, a network of star pointers.
Beneath the Rete, in a hollow, are four thin brass discs, called Tables or Climates, engraved with projections of the sphere for different latitudes.