Muscles are attached to bones by tendons or muscles are attached to bones by tendons or ligaments aponeuroses superficial fascia perimysium

The given blank can be filled with aponeurosis.

The aponeurosis is a fibrous tissues, which posses a white area for the attachment of the bones or some other structures with the muscles. It is a variant of the deep fascia. the structure of the aponeurosis is histologically similar to the tendons. These tissues are rarely supplied with the nerves and the blood vessels.

geologic time scale (for gradpoint) =)

the answer would be   10%