fibrous rings

Examples of fibrous rings in the following topics:

• Fibrous Skeleton of the Heart

  • There are four fibrous rings:
  • The left fibrous ring encircles the bicuspid valve.
  • This ring is the thickest and strongest of all the fibrous rings due to the thickness of the left ventricle, which requires more structural support than the other chambers of the heart.
  • The right fibrous ring encircles the tricuspid valve.
  • Transverse section of the heart showing the fibrous rings surrounding the valves.

• Herniated (Slipped) Disc

  • A disc herniation is a common injury caused by a tear in the fibrous ring of an intervertebral disc, allowing the central portion to bulge.
  • A spinal disc herniation is a medical condition affecting the spine in which a tear in the outer, fibrous ring of an intervertebral disc allows the soft, central portion to bulge out beyond the damaged outer rings .

• Structure, Type, and Location of Cartilage

  • The cartilage fibrous sheath is called the perichondrium.
  • Hyaline cartilage is the most widespread cartilage type and, in adults, it forms the articular surfaces of long bones, the rib tips, the rings of the trachea, and parts of the skull.
  • It owes its flexibility and toughness to the fibrous tissue, and its elasticity to the cartilaginous tissue.
  • Images of microscopic views of the different types of cartilage: elastic, hyaline, and fibrous.
  • Elastic cartilage has the most ECM; hyaline a middle amount; and fibrous cartilage has the least amount of ECM.

• Fibrous Joints

  • Fibrous joints are also called fixed or immovable joints because they do not move.
  • Fibrous joints are connected by dense connective tissue consisting mainly of collagen.
  • Fibrous joints have no joint cavity and are connected via fibrous connective tissue.
  • The skull bones are connected by fibrous joints called sutures.
  • Syndesmoses of long bones and gomphoses of teeth are also types of fibrous joints.

• Structural Classification of Joints

  • There are three structural classifications of joints: fibrous, cartilaginous, and synovial.
  • There are three types of fibrous joints.
  • These moveable fibrous joints are also termed amphiarthrodial.
  • They allow more movement than fibrous joints but less than that of synovial joints.
  • Image demonstrating the three types of fibrous joints.

• Pericardium

  • The pericardium is composed of two layers, an outer fibrous pericardium and an inner serous pericardium.
  • The fibrous pericardium is the outer layer of the pericardium.
  • It is continuous with the outer fibrous layer of the neighboring great blood vessels.
  • The outer layer, the parietal layer, is completely adhered to the fibrous pericardium.

• Adhesions

  • Adhesions are aberrant fibrous bands that form between tissues often following surgery or injury and are similar to internal scarring.
  • Adhesions are fibrous bands that form between tissues and organs, often as a result of injury during surgery .
  • If this is allowed to happen, tissue repair cells such as macrophages, fibroblasts and blood vessel cells, penetrate into the fibrinous adhesion, and lay down collagen and other matrix substances to form a permanent fibrous adhesion.
  • If the infection is continuous or if a foreign body is present, the fibrinous material is converted into fibrous material, forming fibrous adhesions.

• Bursae and Tendon Sheaths

  • Joints are cushioned by small fluid-filled sacs called bursae and stabilized by tough bands of fibrous connective tissue called tendons.
  • Elsewhere, the tendon lies in a bed of loose fibrous tissue.
  • A tendon or sinew is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension.

• Sutures

  • A suture is a type of fibrous joint (or synarthrosis) that only occurs in the skull (or cranium).
  • A suture is a type of fibrous joint (or synarthrosis) that only occurs in the skull.

• Gomphoses

  • A gomphosis is a fibrous joint that binds the teeth to bony sockets in the bones of the maxilla mandible.
  • The gomphosis is made up of fibrous tissue, a collection of tough ligaments that attach to the socket and base of the tooth.