Inclusions

Overview
Inclusions (Cytoplasmic) are chemical substances that may or may not be present in a cell, depending on the cell type. Inclusions are stored nutrients, secretory products, and pigment granules. Examples of inclusions are; glycogen granules in the liver and muscle cells; lipid droplets in fat cells; pigment granules in certain cells of skin and hair; water containing vacuoles; and crystals of various types.

References:
Human Anatomy & Physiology seventh edition by; Elaine N Marieb and Katja Hoehn