Dictionary > Joint capsule

Joint capsule

Definition
noun, plural: joint capsules
A sac-like fibrous tissue that envelopes a synovial joint
Supplement
Synovial joints are movable joints that enable abduction, adduction, extension, flexion, and rotation. It is comprised of a sac-like fibrous joint capsule, a synovial cavity filled with a synovial fluid, and a layer of articular cartilage.
The joint capsule is a sac-like fibrous capsule continuous with the periosteum of the articulating bones. This capsule is made up of two layers: (1) an outer fibrous membrane comprised chiefly of ligaments and (2) an inner synovial membrane. The synovial membrane, in turn, is generally comprised of subintima (an outer layer of connective tissue) and intima. The intimal layer is the inner layer of the synovial membrane with two types of cells: fibroblast-like (type B) synovial cells and macrophage-like (type A) synovial cells. The type B synovial cells release components of the synovial fluid into the synovial cavity. The synovial membrane, therefore, is involved in secreting components for the synovial fluid that fills the synovial cavity. The synovial fluid is the clear, viscid fluid that functions by lubricating the articulating joints, supplying nutrients and oxygen, and removing metabolic wastes.
The joint capsule lacks blood and lymph vessels and therefore receives nutrition by diffusion or by convection.
Synonym(s):

  • articular capsule

See also:

  • synovial joint
  • synovial membrane
  • synovial fluid


    You will also like...

    Angle Oak Tree
    Seed Plants

    Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..

    vitamins
    A Balanced Vitamin Diet – Vitamins A – K

    A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..

    Chemical effects on plant growth and development
    Effect of Chemicals on Growth & Development in Organisms

    Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..

    Balanced Diet
    A Balanced Diet – Minerals and Proteins

    Proteins and minerals can be derived from various dietary sources. They are essential for the proper growth and developm..

    Non-Mendelian Inheritance
    Non-Mendelian Inheritance

    In this tutorial, find out more about certain types of inheritance that does not follow the Mendelian inheritance patter..

    Gene Pool and Speciation
    The Gene Pool and Population Genetics

    According to Charles Darwin's theory of natural selection, preferable genes are favored by nature in the gene pool, and ..