The iliocostalis originates from the sacrum, erector spinae aponeurosis, and iliac crest. The aponeurosis of the external oblique muscle forms the inguinal ligament. It broadens and decreases in thickness (becomes thinner) and becomes the levator aponeurosis. This can occur as a result of senescence, dehiscence or disinsertion of the levator aponeurosis. It lies in the cubital fossa superficial to the bicipital aponeurosis. Another ridge at the base serves for the insertion of the extensor aponeurosis. This fracture is likely caused by the lateral band of the plantar aponeurosis (tendon). Recent studies suggest that the plantar fascia is actually an aponeurosis rather than true fascia. It is derived from the aponeurosis of the abdominal external oblique muscle. The temporal muscle is covered by the temporal fascia, also known as the temporal aponeurosis. These pierce the aponeurosis of the greater trochanter. Laterally, it is continuous with the pharyngeal aponeurosis. Along with that course, the band divides and another segment attaches to the plantar aponeurosis. The mysia also may bind to an aponeurosis or to fascia. From the inner surface of the aponeurosis, many muscle fibres originate.