Endochrine glands can be difficult to identify since they don't all have the same structure. What are a few examples of what different endochrine glands look like?
Adenohypophysis ( anterior pituitary gland ) - looks like clumps of glands, stained red / purple can look like clumps of pomegranate seeds clustered close together.
Adrenal cortex - An adrenal gland sits on top of each kidney, they are made up of an outer cortex surrounding an inner medula. Glands in the adrenal cortex often form rows / lines / sheets, or "cords" of glands.
Thyroid gland - Multicellular, the cells form spheres / globs with the free surface facing inward and the basal surface outward, connected to the connective tissue. Inside the sphere the hormone is stored, attached to a protein for storage purposes. When ready to be released the protein is broken off and the hormone is send on its way through the body. They look like large globs with a border of nuclei around the border at cross section.