direction of muscle fiber to body midline
parallel, rectus abdominis
transverse, transversus abdominis
oblique, external oblique
- Parallel: Rectus abdominis muscle fibers run parallel to the body midline.
- Transverse: Transversus abdominis muscle fibers run transversely or horizontally across the body.
- Oblique: External oblique muscle fibers run obliquely or diagonally to the body midline.