From this origin they proceed upward and laterally to converge near the scapula and end in an aponeurosis to be inserted into a tubercle at the apex of this smooth triangular surface .
An aponeurosis glides over the smooth triangular surface on the medial end of the spine .
From this origin they proceed upward and laterally to converge near the scapula and end in an aponeurosis , which glides over the smooth triangular surface on the medial end of the spine , to be inserted into a tubercle at the apex of this smooth triangular surface .