Which components are present in all synovial joints?

• A. Joint capsule, synovial membrane, synovial fluid, and hyaline cartilage
• B. Fibrous capsule, periosteum, bone marrow
• C. Ligaments, bursae, synovial fluid, and cartilage
• D. Synovial membrane only

Answer: (A)

All synovial joints share a structure that encloses a space and provides smooth movement: a joint capsule surrounding a synovial cavity, with the inner lining called the synovial membrane that produces synovial fluid, and the ends of the bones covered by hyaline cartilage to reduce friction. This combination—joint capsule, synovial membrane, synovial fluid, and hyaline cartilage—is what defines a synovial joint and is present in every one. Other items like periosteum, bone marrow, ligaments, or bursae may be associated with joints but are not universal components of all synovial joints.