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Microscopic anatomy of intact cranial cruciate ligaments in different age groups. (a) Four-month-old cat, weighing 1.2 kg, haematoxylin and eosin (H&E) staining, parallel collagen fibres (arrows); (b) 2-year-old cat, weighing 7 kg, HE staining, increase in collagen (arrow), fibrocytes in longitudinal rows (arrowheads); (c) 5-year-old cat, weighing 2.75 kg, Astra blue staining, rounder cells in chains (arrows)
