Complex sentence: Type I fibres innervate the base of one or two inner hair cells and Type II fibres innervate the outer hair cells, both leave the organ of Corti through an opening called the habenula perforata.
Split into simpler sentences: Type I fibres innervate the base of one or two inner hair cells and Type II fibres innervate the outer hair cells. Both leave the organ of Corti through an opening called the habenula perforata.