![Diagram of a macrofibril.](http://static.sciencelearn.org.nz/images/images/000/003/392/full/WOOL_ITV_FibreStructureAndProps_Macrofibril_edited.jpg?1674170707)
Inside the cortical cells are long filaments called macrofibrils. These are made up of bundles of even finer filaments called microfibrils, which are surrounded by a matrix region.
Image: The University of Waikato Te Whare Wānanga o Waikato
Inside the cortical cells are long filaments called macrofibrils. These are made up of bundles of even finer filaments called microfibrils, which are surrounded by a matrix region.
Image: The University of Waikato Te Whare Wānanga o Waikato