Abstract
The ultra-structure of collagen fibrils has been known for a long time (1, 2, 3). The number of typical cross bands in one period depends on the methods of preparation employed. Wolpers (2, 3) originally described only two cross bands, but more advanced methods now permit us to detect up to 14 (4, 5, 6, 7) and to correlate them with the structural arrangement of macromole-cules (6, 8, 9). Thus the ultrastructure of the single collagen fibril down to the elementary micro-fibrils (7, 10, 11, 12) has been well defined by means of the electron microscope, whereas the interfibrillary relationships of the collagen fiber have received far less attention and are as a result less well-known.
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