articular discs
Disks are found in the temporomandibular joint of the lower jaw, the sternoclavicular (breastbone and collarbone) joint, and the ulnocarpal (inner forearm bone and wrist) joint. A pair of menisci is found in each knee joint, one between each femoral condyle and its female tibial counterpart.
Where is articular disk?
The articular disk is a thin, oval plate, placed between the condyle of the mandible and the mandibular fossa. Its upper surface is concavo-convex from before backward, to accommodate itself to the form of the mandibular fossa and the articular tubercle.
What is another name for articular disc?
Fibrocartilaginous plate that separates the temporomandibular joint into upper and lower cavities. Synonym(s): mandibular disc.
What is articular cartilage?
The bones that meet at synovial joints are covered with a thin layer of cartilage known as articular cartilage. (Articular simply means “having to do with joints.”) Articular cartilage forms a smooth, durable covering (almost the consistency of linoleum) at the end of each bone in the joint.
Is articular disc the same as meniscus?
A meniscus is a crescent-shaped fibrocartilaginous anatomical structure that, in contrast to an articular disc, only partly divides a joint cavity. In humans they are present in the knee, wrist, acromioclavicular, sternoclavicular, and temporomandibular joints; in other animals they may be present in other joints.
Is articular disc avascular?
In young puppies, the degree of vascular penetration into the disc is quite extensive, while in adult animals it ranges from 15 to 25% of the discal width; the considerably larger central area of the articular disc is thus avascular.
What is articular disc in TMJ?
Articular disc – The articular disc is a fibrous extension of the capsule that runs between the two articular surfaces of the temporomandibular joint. The disc articulates with the mandibular fossa of the temporal bone above and the condyle of the mandible below.
What does articular cartilage look like?
Articular cartilage is the smooth, white tissue that covers the ends of bones where they come together to form joints. Healthy cartilage in our joints makes it easier to move. It allows the bones to glide over each other with very little friction. Articular cartilage can be damaged by injury or normal wear and tear.
Why is articular disc important?
The presence of an articular disk also permits a more even distribution of forces between the articulating surfaces of bones, increases the stability of the joint, and aids in directing the flow of synovial fluid to areas of the articular cartilage that experience the most friction.
What are ligaments?
A ligament is a fibrous connective tissue that attaches bone to bone, and usually serves to hold structures together and keep them stable.
What is the articular eminence?
The articular eminence is a part of the temporal bone on which the condylar process slides during mandibular movements. The inclination of articular eminence varies among people and it dictates the path of condylar movement as well as the degree of rotation of the disc over the condyle. 1,2.
What does articular mean in anatomy?
Definition of articular
: of or relating to a joint articular cartilage.
What are articular structures?
27669. Fig. 4.42 B Intra-articular structures and their importance to functional integrity of joints: menisci, articular disks, and articular labra – a Crescent-shaped structures, wedge-shaped in cross section, formed regularly in the knee only, which consist of collagen fibers, connective tissue, and fibrous cartilage
Is articular cartilage fibrocartilage?
Articular cartilage is hyaline cartilage and is 2 to 4 mm thick. Unlike most tissues, articular cartilage does not have blood vessels, nerves, or lymphatics. It is composed of a dense extracellular matrix (ECM) with a sparse distribution of highly specialized cells called chondrocytes.
What is the difference between meniscus and articular cartilage?
Articular cartilage is the tough but smooth covering on the end of bones in most joints. It allows gliding without much resistance and works with the meniscus to cushion the ends of the bone. The meniscus is located between the femur and the tibia.
Do articular discs move freely?
A synovial joint, also known as a diarthrosis, is the most common and most movable type of joint in a mammal’s body. Diarthroses are freely movable articulations. In these joints, the contiguous bony surfaces are covered with articular cartilage and connected by ligaments lined by synovial membrane.
Does articular cartilage produce synovial fluid?
Synovial fluid (SF) is the viscous liquid in the synovial cavity and is secreted by the synovial membrane. Its function is to reduce friction between the articular cartilages of the synovial joint during movement. It is a dialysate from plasma to which components produced locally by joint tissue is added.
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