Collagenous fibers are made up of type I, II, or III collagen. This ratio divides collagenous connective tissue into two types: Loose connective tissue is most common (areolar connective tissue). It appears in small elongated bundles separated by ground substance regions. Collagen fibers are abundant in dense connective tissue. Regular if the tightly packed fiber bundles are aligned in one direction; irregular if they are oriented in multiple directions. Tendons are regular dense connective tissue, while dermis is irregular.
Collagenous fibers are made up of type I, II, or III collagen. This ratio divides collagenous connective tissue into two types: Loose connective tissue is most common (areolar connective tissue). It appears in small elongated bundles separated by ground substance regions. Collagen fibers are abundant in dense connective tissue. Regular if the tightly packed fiber bundles are aligned in one direction; irregular if they are oriented in multiple directions. Tendons are regular dense connective tissue, while dermis is irregular.