Bone adjacent to periodontal ligament that contains a great number of sharpey’s fibres is known as
**Core Concept**
Sharpey's fibers are specialized collagen fibers that penetrate into the bone matrix, providing a critical attachment between the periodontal ligament (PDL) and the surrounding bone. This attachment is essential for the support and stability of teeth within the jaw.
**Why the Correct Answer is Right**
Sharpey's fibers are most prominent in the alveolar bone adjacent to the PDL, where they facilitate the transmission of forces from the tooth to the bone. This process is mediated by the formation of Sharpey's fibers, which are composed of collagen type I and are secreted by the fibroblasts in the PDL. As these fibers penetrate into the bone matrix, they become mineralized, providing a strong attachment between the PDL and the surrounding bone.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because Sharpey's fibers are not primarily found in the cementum, although cementum does play a role in the attachment of the PDL to the tooth.
* **Option B:** This option is incorrect because the periodontal ligament itself is the structure that contains Sharpey's fibers, not the bone adjacent to it.
* **Option D:** This option is incorrect because the bone adjacent to the PDL is not the cortical bone, which is a denser, more compact type of bone found in the outer layers of the jaw.
**Clinical Pearl / High-Yield Fact**
Sharpey's fibers are a key component of the periodontal ligament's attachment to the surrounding bone, and their formation is critical for the support and stability of teeth within the jaw. Understanding the role of Sharpey's fibers in periodontal attachment is essential for the diagnosis and treatment of periodontal diseases.
**Correct Answer:** C.