part of develops from start stage end stage head kidney interrenal gland TAO:0001345 An bilobed multi-tissue structure lateral to the notochord composed of an epithelium consisting of steroid producing cells interposed with chromaffin cells. The interrenal gland is embedded within the head kidney. The interrenal gland is the zebrafish functional equivalent of the mammalian adrenal cortex. zebrafish_anatomy ZFA:0001345 interrenal primordium multi-tissue structure larval:protruding-mouth adult