The study of basic tissues constitutes the foundation of veterinary histology, providing the morphological and functional bases necessary to understand the structure of organs and their relationship with animal physiology and pathology. In the veterinary field, they study four basic tissues that, through their association and specialization, form all the organs and systems of domestic species, each with specific characteristics and functions that determine their importance in the organism. The epithelial tissue is characterized by closely united cells and a sparse extracellular matrix, and fulfills the essential functions of coating, protection and secretion. This tissue is subclassified into lining epithelia, which can be simple or stratified, and into glandular epithelia, which are divided into exocrine and endocrine. Its relevance in veterinary medicine is paramount, since it constitutes the skin, the mucous membranes and the glands, acting as the first barrier of defense against external agents and actively participating in absorption and secretion processes. The connective tissue is distinguished by having an abundant extracellular matrix with dispersed cells, which fulfill vital functions of support, union and defense. This tissue includes various variants such as connective tissue (loose and dense), adipose, cartilaginous, bone and blood tissue. In veterinary practice, its study is crucial to understanding the structural support of the organism, energy storage and immune response mechanisms that guarantee animal health. The muscle tissue is formed by cells specialized in contraction, responsible for movement and contractility. It is classified into three main types: skeletal striated muscle, of voluntary character; músculo striado cardiac, de naturale involuntaria; and smooth muscle, also involuntary. The veterinary relevance of this tissue ranges from locomotion and posture to cardiac function and visceral movements and is essential for the integral functioning of the organism. The nervous tissue is composed of neurons and glial cells specialized in the transmission of electrical impulses, performing communication and coordination functions. It is divided into the central nervous system, which includes the brain and the spinal cord, and the peripheral nervous system, formed by nerves and ganglia. His study in veterinary medicine is fundamental to understanding the integration of bodily functions and the adaptive response to the environment, key aspects of animal behavior and well-being. The importance of the study of these tissues lies in the fact that it allows to interpret the relationship between structure and function, both in normal and pathological conditions. For example, understanding the organization of the respiratory epithelium facilitates the diagnosis of bronchitis, while knowledge of cardiac muscle tissue is essential to identify myopathies. This introduction lays the foundations for exploring how the interaction between these four tissues gives rise to the anatomical and functional complexity that characterizes domestic animals, always integrating the clinical perspective with the fundamental histological principles.

This book is included in DOAB.