What is the purpose of perforating fibers?
Periosteal Sharpey’s fibers: a novel bone matrix regulatory system? Sharpey’s “perforating” fibers (SF) are well known skeletally in tooth anchorage. Elsewhere they provide anchorage for the periosteum and are less well documented.
What is the periosteum?
The periosteum is a complex structure composed of an outer fibrous layer that lends structural integrity and an inner cambium layer that possesses osteogenic potential. During growth and development it contributes to bone elongation and modeling, and when the bone is injured, participates in its recovery.
What are perforating fibers and where are they found?
n. Any of the bundles of collagen fibers that pass into the outer circumferential lamellae of bone or into the cementum of teeth.
What is gingival tissue?
The gingival tissues (or gingiva, frequently called gums in laypersons’ terms) are the soft tissues that cover the alveolar bone of the jaws and the teeth up to the exposed crown of the teeth.
What is the maxillary alveolus?
On the maxilla, the alveolar process is a ridge located on the inferior surface. On the mandible, it is a ridge located on the superior surface. It comprises of the thickest part of the maxillae. The alveolar process is the lining of the tooth’s socket and referred to as the alveolus.
What type of tissue is the periosteum?
connective tissue
The periosteum is a thin layer of connective tissue that covers the outer surface of a bone in all places except at joints (which are protected by articular cartilage).
What is the central canal in bone?
The osteon consists of a central canal called the osteonic (haversian) canal, which is surrounded by concentric rings (lamellae) of matrix. Between the rings of matrix, the bone cells (osteocytes) are located in spaces called lacunae.
What does Sharpey fibres mean?
Shar·pey fi·bers. (shahr’pē fībĕrz) Bundles of collagenous fibers that pass into the outer circumferential lamellae of bone, alveolar bone proper of the alveolus of teeth, or the cementum of teeth.
What is the density of Sharpey’s fibretubules?
The density of Sharpey’s fibretubules in the middle and basal layers can be high (Figs 813; 913, F); the fibre tubules are distributed irregularly or relatively horizontally. Vascular canals and Sharpey’s fibretubules occurred in both the middle and lower layers.
How do Sharpey’s fibres differ between bone and cellular cementum?
Sharpey’s fibres in the primary acellular cementum are mineralized fully; those in cellular cementum and bone are mineralized only partially at their periphery.
What is the function of Sharpey fibres in the skull?
In the skull the main function of Sharpey’s fibres is to bind the cranial bones in a firm but moveable manner; they are most numerous in areas where the bones are subjected to the greatest forces of separation.