Sharpey’s fibres are present in:
**Core Concept**
Sharpey's fibres are a type of collagen fibres that are involved in the attachment of tendons to bone. These fibres are unique in that they penetrate the periosteum and insert into the bone matrix, providing a strong and stable connection between the tendon and the bone.
**Why the Correct Answer is Right**
Sharpey's fibres are responsible for withstanding the mechanical stresses and strains imposed on the tendon during movement. The fibres are composed of type I collagen and are rich in proteoglycans, which help to facilitate the transfer of forces from the tendon to the bone. The presence of Sharpey's fibres is essential for the normal functioning of tendons and the prevention of tendon injuries.
**Why Each Wrong Option is Incorrect**
**Option A:** Sharpey's fibres are not found in the synovial membrane.
Sharpey's fibres are specifically associated with the attachment of tendons to bone, and are not found in the synovial membrane, which is a thin layer of connective tissue that surrounds joints and tendons.
**Option B:** Sharpey's fibres are not involved in the production of bone matrix.
Sharpey's fibres are involved in the attachment of tendons to bone, but they are not responsible for the production of bone matrix. That function is carried out by osteoblasts.
**Option C:** Sharpey's fibres are not found in the periodontal ligament.
Sharpey's fibres are specifically associated with the attachment of tendons to bone, and are not found in the periodontal ligament, which is a group of fibres that attach the tooth to the surrounding bone.
**Clinical Pearl / High-Yield Fact**
Sharpey's fibres are a key component of the tendon-bone interface, and their disruption can lead to tendon injuries and other musculoskeletal disorders. Understanding the role of Sharpey's fibres is essential for the diagnosis and treatment of these conditions.
**Correct Answer: C. Periodontal ligament is incorrect. Sharpey's fibres are actually found in the Periosteum of the bone.**