Fibrous joints are a structural class of joints where skeletal elements are connected by collagen fibers, a type of dense connective tissue. The specific type of dense connective tissue used in these joints can vary based on the joint's function, but dense irregular connective tissue is commonly found in fibrous joints. The primary role of collagen fibers is to provide strength, contributing to the structural stability of these joints. However, this stability comes with a trade-off: fibrous joints have limited mobility.

Fibrous joints are classified into two categories based on their movement capabilities: synarthroses and amphiarthroses. Synarthroses are immovable joints, allowing for no movement, while amphiarthroses permit slight or moderate movement. This classification is visually represented by symbols, where synarthroses lack a movement arrow, indicating no movement, and amphiarthroses feature a single movement arrow, signifying limited movement.

There are three main types of fibrous joints: sutures, gomphoses, and syndesmoses. Each type has unique characteristics and functions, which will be explored in detail in subsequent discussions. Understanding these joints is essential for grasping the broader concepts of joint structure and function in the human body.