there are two regions of steroidogenic tissue in the bird adrenal gland : a subcapsular zone ( scz ) 40-60 cells thick consisting of cells with irregularly shaped nuclei , relatively little smooth endoplasmic reticulum , and mitochondria with shelflike cristae that surrounds an inner zone ( iz ) of tissue comprised of smaller cells with rounded nuclei , a more abundant endoplasmic reticulum , and mitochondria with tubular cristae .
C0007634
cells
C0007610
nuclei