What is the study of the internal structure of individual cells called?

The study of the internal structure of individual cells is known as cytology. This field focuses on the examination of cell components, their function, and interactions. Cytologists investigate structures such as the nucleus, organelles, and cell membrane, allowing for a deeper understanding of cellular processes and how cells contribute to the functioning of tissues and organs.

In contrast, histology pertains to the study of tissues and their organization, making it focused on groups of cells rather than individual cells. Morphology deals with the shape and structure of organisms or their specific parts, encompassing both cells and entire systems, while embryology is the study of the development of organisms from fertilization to birth. Thus, cytology is the most precise term for the study of individual cell structures.