Lesson
Trunk Muscles - continued
Main ABDOMINAL muscles:
Rectus Abdominis
External Obliques
Internal Obliques
Bilateral action:
Major spinal flexors AND Anterior Pelvic Tilt reducers
Uniteral action
Lateral flexion towards side of tensed muscles
Internal oblique tension = rotation of spine to same side
External oblique tension = rotation of spine to opposite side
If SPINE fixed, unilateral action:
Internal obliques produce pelvic rotation to opposite side and external obliques to same side.