Fibrous Joints

Joints can simply be defined as a point or the location within the body where two or more bones meet together. In all vertebrates, joints are mainly involved in connecting bones within the human body.

Arthrology is the study of joints, related to the types, structures, functions, disorders and treatment of different joint disorders.

Based on their mobility, joints are classified into three types:

  1. Fibrous Joints
  2. Synovial Joints
  3. Cartilaginous Joints

Explore more: Joints

Let’s learn more in detail about Fibrous joints.

What are Fibrous joints?

Fibrous joints are defined as fixed or immovable joints, which are mainly limited to a few parts of the human body. They form a connection between bones and are held together by fibrous connective tissues, including collagen fibers.

Skull is the best example of a fibrous joint. In this type of immovable joint, the bones are fused together in such a way that they are fixed to that part and frame a structure. Other than the skull, backbone, pelvic bone, rib cage and upper jaw are all examples of fibrous joints.

Types of Fibrous joints

Based on the location, these joints are further classified into three types:

  • Sutures

The suture joints are immovable or a fixed joint consisting of a thin layer of dense fibrous connective tissue, which are found attached to certain bones of the skull. These joints also provide strength to the joint by attaching the irregular interlocking edges of cranial bone. Sutures are the sites of active bone growth.

Depending upon the shape of articulating surfaces and the mode of fusion of articulating bones, the sutures are further divided into:

  1. Serrate sutures — Example: Joints between the parietal bones.
  2. Denticulate sutures –Example: Joints between the parietal and occipital bones.
  3. Squamous sutures –Example: Tempro parietal suture present between temporal and parietal bones.
  4. Limbous sutures: It is a slightly modified squamous suture. Example: Modified Tempro parietal suture.
  5. Plane sutures –These types of sutures are present between the horizontal plates of two palatine bones.
  6. Wedge and groove sutures–Joints present vomer bone and rostrum of the sphenoid bone.
  • Gomphosis

It is a specialized fibrous joint, which provides an independent and firm suspension for each tooth. It fits the teeth into their sockets, which are situated in the maxilla and the mandible. The gomphosis fibrous joints are also referred to as peg and socket joints.

Also Read: Types of Teeth

  • Syndesmoses

It is a type of fibrous joint, where two different bones are united with each other by interosseous ligaments. Joints between the vertebrates, coracoclavicular joints and old Sacroiliac joints are all examples of syndesmoses fibrous joints.

Also Refer: Types of Joints

This article concludes with an introduction to fibrous joints, their types, structure and functions. To know more about joints, types of joints, other related topics and important questions, keep visiting our website at BYJU’S Biology.

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