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The linea alba is a fibrous structure that runs down the midline of the abdomen in humans and other vertebrates. In human linea alba runs from xiphoid process to pubic symphysis. The name means white line and the linea alba is indeed white, being composed mostly of collagen connective tissue. It is formed by the fusion of the aponeuroses of the abdominal muscles, and it separates the left and right rectus abdominis muscles.
Forexample, in a headwind or sinkingair mass, the flight path angle AERO 13 Angle of attack (AOA) is theangle between the oncoming air or relative wind and a reference lineon the airplane or wing. Sometimes,the reference line is a line connect-ing the leading edge and trailingedge at some average point on thewing.