![]() Gliding does not involve rotation around any axis, and gliding joints are the only examples of nonaxial plane joints Examples are the gliding joints introduced earlier-the intercarpal and intertarsal joints, and the joints between vertebral articular processes. Plane Joints: Multiaxial joint, the articular surfaces are essentially flat, and they allow only short nonaxial gliding movements.(f) The hip and shoulder joints are the only ball-and-socket joints of the body. (e) The radiocarpal joint of the wrist is a condyloid joint. (d) Plane joints, such as those between the tarsal bones of the foot, allow for limited gliding movements between bones. (c) The articulation between the trapezium carpal bone and the first metacarpal bone at the base of the thumb is a saddle joint. (b) The hinge joint of the elbow works like a door hinge. ![]() (a) Pivot joints allow for rotation around an axis, such as between the first and second cervical vertebrae, which allows for side-to-side rotation of the head. Image 4: Types of Synovial Joints: The six types of synovial joints allow the body to move in a variety of ways. Additional features surrounding some Synovial Joints The capsule and fluid protect the cartilage, muscles, and connective tissues. Together, they are protected by a joint capsule lined with a synovial membrane that produces synovial fluid. In a Synovial joint, the ends of bones are encased in smooth cartilage. long head of biceps tendon within the shoulder joint Intracapsular ligament: located inside of the articular capsule.Intrinsic ligament: fused to or incorporated into the wall of the articular capsule.Can serve to smooth the movements between the articulating bones eg at the temporomandibular joint. These structures can serve several functions, depending on the specific joint. Fibrocartilage structure located between the articulating bones: Articular disc, which is generally small and oval-shaped, or a Meniscus, which is larger and C-shaped.Īdditional features within some Synovial Joints Hyaline articular cartilage: acts like a Teflon® coating over the bone surface, allowing the articulating bones to move smoothly against each other without damaging the underlying bone tissue.Synovial cavity containing synovial fluid.Articular capsule with synovial membrane.There are six such classifications: hinge (elbow), saddle (carpometacarpal joint), planar (acromioclavicular joint), pivot (atlantoaxial joint), condyloid (metacarpophalangeal joint), and ball and socket (hip joint). Synovial joints are often further classified by the type of movements they permit. This is called an articular disc, which is generally small and oval-shaped, or a meniscus, which is larger and C-shaped. A few synovial joints of the body have a fibrocartilage structure located between the articulating bones. The articular cartilage and the synovial membrane are continuous. Hyaline cartilage forms the articular cartilage, covering the entire articulating surface of each bone. This fluid-filled space is the site at which the articulating surfaces of the bones contact each other. The joint cavity contains synovial fluid, secreted by the synovial membrane ( synovium), which lines the articular capsule. Ī key structural characteristic for a synovial joint that is not seen at fibrous or cartilaginous joints is the presence of a joint cavity. These joints are termed diarthroses, meaning they are freely mobile. Synovial joints are the most common type of joint in the body (see image 1). The three joints in the body (Histologically) are fibrous, cartilaginous, and synovial.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |