This document outlines the four main types of animal tissues: epithelial, muscle, nerve, and connective tissue. Epithelial tissue covers surfaces, is tightly packed with cells, and lacks blood vessels. There are three types classified by structure: simple, stratified, and pseudostratified. Muscle tissue can contract and is divided into skeletal, smooth, and cardiac muscle. Nervous tissue conducts electrical signals and contains neurons and glial cells. Connective tissue includes areolar, tendon, ligament, bone, blood, and adipose tissue. It possesses fibers, scattered cells, and ground substance. Membranes include cutaneous, mucous, and serous tissues.