it was found that within 1 min after sperm were introduced into the vent , they progressed in a random pattern past the apertures of the spermatheca ( the glandular , sperm storage organ that opens from the anterior roof of the cloaca ) forward to the anterior end of the cloaca and on into the posterior regions of the hindgut and bladder .
C0008987
cloaca
C0231053
hindgut