The study of tissue is called histology. It deals with the microstructures of both plants and animals. The microstructure includes the cell and tissues as major components. However, if the major concern is the disease of tissues, then the study is called histopathology.
The study of human and animal tissues is known as histology or, in connection with disease, histopathology. ... The classical tools for studying tissues are the paraffin block in which tissue is embedded and then sectioned, the histological stain, and the optical microscope.