http://upload.wikimedia.org/wikipedia/commons/e/e6/Aponeurosis.png

Aponeuroses are layers of flat broad tendons. They have a shiny, whitish-silvery color, and are histologically similar to tendons, but are very sparingly supplied with blood vessels and nerves. When dissected, aponeuroses are papery, and peel off by sections. The primary regions with thick aponeurosis is in the ventral abdominal region, the dorsal lumbar region, and in the palmar region. Their primary function is to join muscles and the body parts the muscles act upon[Wikipedia:Aponeurosis].

in ZFA, aponeuroses are subtypes of tendons, but this is inconsistent with tendons being muscle-bone connections

uberon

aponeuroses, aponeurotic

UBERON:0006614