抄録
Chondrichthyean interrenal cells contain a lot of fat droplets stainable with Sudan IV or Oil Red O, as in mammalian adrenocortical cells. However, the droplets are not detectable in the teleostean interrenal cells treated with these fat-soluble dyes. In the present study, six speci-mens of a holostean fish Lepisosteus osseus (longnose gar) were used and histological examinationwas made on the interrenal gland after fixing in 10% neutral formalin quid and stainlng with Oil Red O, in addition to Bouin's fluid fixation and H-E stain. From this examination, it was ascer-tained that the fat droplets are abundantly included in the interrenal cells of the longnose gar.From the viewpoint of fat droplet inclusion, therefore, the interrenal cells of this holostean fish are akin to those of cartilaginous fish, rather than the teleostean interrenal cells.
