[Ultrastructure of interrenal (adrenocortical) cells of an elamobranch, the common dogfish (Scyliorhinus caniculus L)]

The interrenal (adrenocortical) cells of the common dogfish show the ultrastructural features characteristic of steroid hormone producing cells. Their endoplasmic reticulum consists predominantly of smooth surfaced tubules. They are rich in mitochondria with tubular and vesicular cristae and in liposomes. This last characteristic differentiates them from the interrenal cells of Teleosts, which are devoid of liposomes. In addition, the interrenal cells of the common dogfish are strikingly rich in microfilament-like inclusions.