This textbook of histology incorporates light and electron micrographs, schematic diagrams and three dimensional drawings to facilitate conceptual learning progressing from cell to tissue, to organ and organ system for a clearer understanding of histology. It presents histology from a functional perspective by encompassing cell and molecular biological concepts without neglecting classical morphology. The text emphasizes intimate relationships between form and function, incorporating clinical material in each chapter to illustrate that the knowledge of histology is pertinent not only to physiology and pathology, but also forms one of the essential basis of clinical practice.