Spermatheca:
The spermatheca is part of the female reproductive organs.
It is the place, where the sperms are stored, after they entered
through the spermathecal duct [D]. Sometimes the spermatheca
is paired [taxonomical importance]. It is a cuticular organ.
When an egg passes along the oviduct, stored sperm from the
spermatheca is released and moves into the bursa copulatrix.
A ring of glands is surrounding the bulga and secrets nutrient
material into the lumen, before the organ receives sperm.
Strigillae:
Fine ridges in the bulga. These corrugations are filled with
secretion from the spermathecal glands in mature fleas, and
the sperms are packed tightly between those ridges.