In bone or tendon. The extracellular matrix id plentiful, and the cells are sparsely distributed within it. The matrix is rich in fibrous polymers, especially collagen. In these tissues, it is the matrix, rather than the cells, that bears most of the mechanical stress to which the tissue is subjected. Direct attachments are relatively rare, but the cells have important attachments to the matrix allowing them to pull on it and to be pulled on by it.