Fig. 3

The adrenal gland in the European bison. a Thick connective tissue capsule, Stain = H&E, Bar = 100 μm; b The inner and outer layer of the connective tissue capsule, Stain = H&E, Bar = 100 μm; c Adipose and inner layer of connective tissue capsule formed from collagen fibers, Stain = Azan trichrome, Bar = 100 μm; d Inner layer of connective tissue capsule with thick and regular strands of elastic fibers. Stain = Masson-Goldner trichrome. Bar = 50 μm; e Collagen fibers arranged in a mesh. Stain = Azan trichrome. Bar = 100 μm. Cap – capsule, OL – outer layer, IL – inner layer, AT – adipose tissue, T – trabeculae, ZG – zona glomerulosa, ZF – zona fasciculata, C – cortex, BV – blood vessels