Applied anatomy and kinesiology, the mechanism of muscular movement . back show the direction of the spinous pro-cesses. (Lovett.) in the thoracic region a lateral bend rotates the spinous processesto the same side and in the lumbar region to the opposite side. The principal muscles flexing the spine are the psoas, rectusabdominis, and external and internal oblique. These muscles,excepting the psoas, which has been previously described, are inthe front and side walls of the abdomen and, along with transver-salis, which lies beneath them are commonly called the abdominalmuscles. RECTUS ABDOMINI
Applied anatomy and kinesiology, the mechanism of muscular movement . back show the direction of the spinous pro-cesses. (Lovett.) in the thoracic region a lateral bend rotates the spinous processesto the same side and in the lumbar region to the opposite side. The principal muscles flexing the spine are the psoas, rectusabdominis, and external and internal oblique. These muscles,excepting the psoas, which has been previously described, are inthe front and side walls of the abdomen and, along with transver-salis, which lies beneath them are commonly called the abdominalmuscles. RECTUS ABDOMINIS 211 RECTUS ABDOMINIS. A rather slender muscle extending vertically across the front ofthe abdominal wall. The right and left recti are separated by atendinous strip about an inch wide called the linea alba (white line). Origin.—The crest of the pubes. Insertion.—The cartilages of the 5th, 6th, and 7th ribs. Structure.—Parallel fibers, crossed by three tendinous lower end of the rectus passes through a slit in the transversalisand lies beneath
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