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Synovial Membrane

A layer of connective tissue that lines the cavities of joints, tendon sheaths, and bursae (fluid-filled sacs between tendons and bones). The synovial membrane makes synovial fluid, which has a lubricating function.

PubMed Health Glossary
(Source: NIH - National Cancer Institute)

This illustration shows a healthy joint. In this healthy joint, the ends of the bones are encased in smooth cartilage and are protected by a joint capsule that is lined with a synovial membrane that produces synovial fluid. The capsule and fluid protect the cartilage, muscles, and connective tissue. The muscles, medial collateral ligament, joint capsule, tendons, synovial membrane, anterior cruciate ligament, posterior cruciate ligament, cartilage, lateral collateral ligament, synovial fluid, and bone are labeled. Click to enlarge

Parts of a joint and ligaments National Institutes of Health

Terms to know

Anterior Cruciate Ligament (ACL)
A major stabilizing ligament in the knee.
Articular Cartilage
The cartilage that covers the ends of each bone in a joint.
Bone
A living, growing tissue made mostly of collagen.
Cartilage
A tough, flexible tissue that lines joints and gives structure to the nose, ears, larynx, and other parts of the body.
Collateral Ligaments
A number of ligaments on either side of, and serving as a radius of movement of, a joint having a hingelike movement.
Joint Capsule
Dense fibrous connective tissue sealing the joint. It is attached to the bones and provides stability.
Joints
In medicine, the place where two or more bones are connected. Examples include the shoulder, elbow, knee, and jaw.
Medial Ligaments
Term used for various ligaments toward the midline of the human body.
Muscles
Muscles function to produce force and motion. They are primarily responsible for maintaining and changing posture, locomotion, as well as movement of internal organs, such as the contraction of the heart and the movement of food through the digestive system.
Posterior Cruciate Ligament (PCL)
The posterior cruciate ligament (or PCL) is one of the four major ligaments of the knee. It lies deep within the knee joint.
Synovial Fluid
The slippery fluid produced by the synovium (joint lining) to lubricate the joints.
Tendon Sheath
A tendon sheath is a layer of membrane around a tendon. It permits the tendon to move. It has two layers: synovial sheath and fibrous tendon sheath.
Tendons
Tough, fibrous, cord-like tissue that connects muscle to bone or another structure, such as an eyeball. Tendons help the bone or structure to move.

Terms to know

Anterior Cruciate Ligament (ACL)
A major stabilizing ligament in the knee....
Articular Cartilage
The cartilage that covers the ends of each bone in a joint....
Bone
A living, growing tissue made mostly of collagen....
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