Describe how the structure of immovable joints contributes to their function in the human body. (4 marks)
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Sample Answer
- Immovable (fibrous) joints consist of bones held firmly together by dense fibrous connective tissue. This rigid connection prevents any movement between bones, ensuring complete stability.
- In skull sutures, the interlocking edges of adjacent cranial bones create a jigsaw-like pattern. These interlocking surfaces increase contact area and strengthen the connection, forming a protective shell.
- The dense fibrous tissue fills all gaps between bones. Such complete fusion provides maximum strength to withstand external forces and protect vital organs like the brain.
- Unlike synovial joints, immovable joints lack joint cavities and synovial fluid. The absence of these structures reflects their specialised function of providing stability rather than movement.
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Sample Answer
- Immovable (fibrous) joints consist of bones held firmly together by dense fibrous connective tissue. This rigid connection prevents any movement between bones, ensuring complete stability.
- In skull sutures, the interlocking edges of adjacent cranial bones create a jigsaw-like pattern. These interlocking surfaces increase contact area and strengthen the connection, forming a protective shell.
- The dense fibrous tissue fills all gaps between bones. Such complete fusion provides maximum strength to withstand external forces and protect vital organs like the brain.
- Unlike synovial joints, immovable joints lack joint cavities and synovial fluid. The absence of these structures reflects their specialised function of providing stability rather than movement.