Textbook of Histology

The basic functional unit of complex organisms is the cell. Cells that have or serve a common purpose congregate to form tissues, which, in animals — specifically, mammals — are placed in four categories (epithelium, connective tissue, muscle, and nervous…

Although histology is the microscopic study of tissues of living organisms, be they animals or plants, this textbook discusses only mammalian—more specifically, human—tissues. However, the term has evolved to have a broader concept, named microscopic anatomy , because its subject…