Physiology
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Boundless Anatomy and Physiology
Joints
Fibrous Joints
Physiology Textbooks Boundless Anatomy and Physiology Joints Fibrous Joints
Physiology Textbooks Boundless Anatomy and Physiology Joints
Physiology Textbooks Boundless Anatomy and Physiology
Physiology Textbooks
Physiology
Concept Version 13
Created by Boundless

Fibrous Joints

Fibrous joints are also called fixed or immovable joints because they do not move.

Learning Objective

  • Differentiate among the three classifications of joints: fibrous, cartilaginous, and synovial


Key Points

    • A joint is the location at which two or more bones make contact.
    • Joints are classified based on structural and functional properties.
    • Fibrous joints, such as sutures, syndesmoses, and gomphoses, have no joint cavity.
    • Fibrous joints are connected by dense connective tissue consisting mainly of collagen. 
    • Fibrous joints are called "fixed" or "immovable" joints because they do not move.

Terms

  • syndesmoses

    Slightly movable articulations where the contiguous bony surfaces are united by an interosseous ligament, as in the inferior tibiofibular articulation.

  • suture

    In anatomy, a suture is a fairly rigid joint between two or more hard elements such as the bony plates of the skull.

  • gomphoses

    A joint that binds the teeth to bony sockets (dental alveoli) in the maxillary bone and mandible.


Full Text

A joint is the location at which two or more bones make contact. They are constructed to allow movement (except for skull bones), provide mechanical support, and are classified structurally and functionally. Structural classification is determined by how the bones connect to each other, while functional classification is determined by the degree of movement between the articulating bones. In practice, there is significant overlap between the two types of classifications. 

Structural classification names and divides joints according to the type of binding tissue that connects the bones to each other. There are three structural classifications of joints: 

Fibrous joints are joined by dense irregular connective tissue that is rich in collagen fibers.

Cartilaginous joints are joined by cartilage.

Synovial joints are those in which the bones are not directly joined. These joints have a synovial cavity and are united by the dense irregular connective tissue that forms the articular capsule normally associated with accessory ligaments.

Characteristics of Fibrous Joints

Fibrous joints are connected by dense connective tissue consisting mainly of collagen. These joints are also called fixed or immovable joints because they do not move. Fibrous joints have no joint cavity and are connected via fibrous connective tissue. The skull bones are connected by fibrous joints called sutures. The skull bones of a fetus are unfused so that they can move over each other slightly to compress skull size during birth. After birth, the bones slowly begin to fuse to become fixed, making the skull bones immovable in order to protect the brain from impact.

Syndesmoses of long bones and gomphoses of teeth are also types of fibrous joints. The movement of the root within a gomphosis has a threefold effect. It lessens some of the impact between the upper and lower teeth in biting. It also pumps blood and lymph from the periodontal membrane into the dental veins and lymph channels and stimulates sensory nerve terminals in the membrane to send signals to the brain centers that control the muscles of mastication.

Fibrous Joints

The adult skull is normally made up of 22 bones. Except for the mandible, all are joined together by sutures, semi-rigid articulations formed by bony ossification. The presence of Sharpey's fibers permit a little flexibility.

This diagram delineates certain bones of the skull, including the mandible, maxilla, sphenoid, parietal, lacrimal, nasal, frontal, temporal, zygomatic, and ethmoid.
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