A tendon is made up mostly of collagenous fibres and is a thick, fibrous connective tissue. The fundamental components of a tendon are primary collagen fibres, which are made up of clusters of collagen fibrils.
Primary fibres are gathered into primary fibre bundles (subfasicles), and collections of these bundles make secondary fibre bundles (fasicles). Tertiary fibre bundles are formed by a number of secondary fibre bundles, and these bundles in turn form the tendon unit. The endotenon, a connective tissue sheath that surrounds the primary, secondary, and tertiary bundles, makes it easier for the bundles to glide against one another when the tendon moves. The thin layer of connective tissue that sheathes the tendon unit, the epitenon, is next to the endotenon.
Lying outside the epitenon and contiguous with it is a loose elastic connective tissue layer known as paratenon, which allows the tendon to move against neighbouring tissues. The tendon is attached to the bone by collagenous fibres (Sharpey fibres) that continue into the matrix of the bone.
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