Cementum is a specialized calcified substance covering the root of a tooth. The cementum is the part of the periodontium that attaches the teeth to the alveolar bone by anchoring the periodontal ligament. 1 Development.
When pulled tight, this complex band of tissue can cause the spine, hip and knee to lose its natural alignment, and possibly cause some pain or problems with strength movements. The upper medial fibers also blend into the fibers of the thoracolumbar fascia, which means it has a role in low back structure too.
A band contains thick & thin filaments I band contains only thin filaments H zone is only thick filaments During contraction the A band does not change length, the I band narrows, and the H zone narrows or disappears Right? So i can understand how the myosin (thick) filaments could shorten because the H zone shortens,