Histology: It is the microscopic study of tissues of the body and how these tissues are organized to form organs. The word "histology" is derived from two Greek words, histo="tissue" and logos="study". In histology, two main components of the tissues are studied: (i) cells and (ii) extracellular matrix. Learn More at: http://www.getmededu.com/histology-definition-and-importance.html