ridges where muscles are attached
From Wikipedia, the free encyclopedia. For the band, see Linea Aspera (band) . The linea aspera (Latin: rough line) is a ridge of roughened surface on the posterior surface of the femur, to which are attached muscles and intermuscular septum.Its margins diverge above and below. number of muscles attach to the linea aspera: 1  From the medial lip of the linea aspera and its prolongations above and below, the vastus medialis originates. 2  From the lateral lip and its upward prolongation, the vastus lateralis takes origin.