23/11/2025
The internal oblique muscles form a key part of the abdominal wall and play an important role in core stability and trunk movement.
These muscles are positioned beneath the external oblique muscles and above the transverse abdominis. They are broad, fan-shaped muscles that extend upward and inward from the iliac crest of the pelvis to the lower ribs and the linea alba (the fibrous band running along the centre of the abdomen).
The internal obliques assist in several key functions:
- Trunk rotation and lateral flexion: They help rotate the torso and bend the body sideways by contracting on one side.
- Flexion of the spine: When both sides contract together, they assist in bending the torso forward.
- Core stabilisation: Working with other abdominal muscles, the internal obliques support posture and spinal alignment.
- Respiration: They play a role in forced exhalation by compressing the abdominal cavity and helping move air out of the lungs.
Together with the external oblique, transverse abdominis, and re**us abdominis muscles, the internal obliques form part of the functional core unit that maintains trunk stability, protects internal organs, and contributes to controlled movement and balance.
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