Eyespot rasbora ventral area of the body between the operculum and the pelvic fins (corresponding roughly to the sac enclosing the alimentary canal). Under conditions of reflectied light, the fish sometimes displays a fine lateral band from the opeculum to the end of the caudal peduncle (Walker, 1971, p. 98) this being an olive-gold hue. The fins, with the exception of the dorsal fin, are hyaline, the relation of the pectoral and pelvic fins being typical of the ostariophysans (fishes possessing an auxiliary mechanism for detecting sound consisting of a set of internal bones called the Weberian Ossicles). In such fishes, the
Caudal cell mass The cavities formed from the initial and secondary neuralation combine to form one uninterrupted cavity. There is still specualtion on the formation of the caudall cell mass in humans with arguments being made for it arising from many cavities or the continuing growth of the neurocele from the initial neuralation. The caudal cell mass will ultimately differentiate and form into many sacral structures such various nerve endings and the conus medullaris. The caudal cell mass plays a role in many diseases and abnomalities related to the spinal cord. One group of abnormalities it plays a role in are occult spinal