This zona fasciculata is the largest zone of adrenal gland cortex in animal. Zona fasciculate of adrenal gland cortex histology You may find few acidophilic granules in the cell of bovine zona glomerulosa layer. But in dog, cat, pig and horse these cells are arranged in arcs so this zone is also called zona arcuata in these animals.

Generally in ruminant, you will find irregular clusters and cords of cells. These cells of zona glomerulosa generally arranged in closely packed or cluster or in arcs in different animals. You will find tall columnar cell in horse, donkey’s adrenal gland cortex histology whereas spherical shaped in other domestic animals. The cell in this layer varies from tall columnar to spherical in different species. You will find this layer just beneath of the thin capsule of adrenal gland.

Zona glomerulosa of adrenal glands cortex histology You might identify these different zones from adrenal gland cortex histology under light microscope. Zona reticularis – this is innermost zone of adrenal cortex and adjacent to the adrenal medullaīut you will find the zona intermedia of adrenal cortex in few animals like horse, dog, and cat even in ruminant (occasionally). Zona fasciculate – this is the largest and intermediate zone in between the zona glomerulosa and zona reticularis of adrenal cortex Zona glomerulosa – this is the outermost zona in adrenal glands cortex histology You will find the following three main zones in adrenal gland histology in most of the animals – The cortex of adrenal gland is subdivided into three distinct zones in different animals. I am going to discuss these two different concentric layers of adrenal gland separately here in this article. Adrenal medulla – this is the central layer of adrenal gland and reddish brown in color Adrenal cortex – that is generally yellow in color at this is the peripheral zone of adrenal gland You will find the following two concentric layers in adrenal gland histology in different animals –

The trabeculae originated from this thin capsule but not enter into the medulla of adrenal gland. Histologically, there is a thin layer of capsule that usually made with dense irregular connective tissue along with few smooth muscle fibers. Two types of chromaffin cells and structure of adrenal medulla in animal adrenal gland Cells and structure of zoan reticularis (cortex of adrenal gland) Cells and structure of zona fasciculate (cortex of adrenal) Cell and structure of zona glomerulosa (cortex of adrenal gland)