General information
The lateral oblique abdominal wall muscles are composed of the muscles M. obliquus externus abdominis, M. obliquus internus abdominis and M. transversus abdominis.
The most important functions of the abdominal wall muscles are the movement of the trunk, the stabilization of the spine and the tension of the abdominal wall. They belong to the expiratory auxiliary respiratory muscles. By increasing the intraabdominal pressure, they enable the so-called abdominal press.
A schematic drawing of the muscles (M. obliquus externus abdominis, M. obliquus internus abdominis and M. transversus abdominis) can be displayed by clicking on the respective name in the "WebViewer".
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M. obliquus externus abdominis |
M. obliquus internus abdominis |
M. transversus abdominis |
| origin |
Outside surface of the 5th-12th rib |
- deep leaf of Fascia thoracolumbalis
- Linea intermedia of Crista iliaca
- Spina iliaca anterior superior
- lateral half of ligament inguinale
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- Internal surfaces of the 7th-10th rib cartilage and the 11th and 12th rib
- deep leaf of Fascia thoracolumbalis
- i>Labium internum of Crista iliaca, Spina iliaca anterior superior
- lateral part of Ligamentum inguinale
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| insertion |
- Labium externum of Crista lilica
- Ligamentum inguinale
- Tuberculum pubicum
- front leaf of rectus sheath
- Linea alba
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- bottom margins of the 10th-12th rib
- front and back leaf of the rectus sheath
- line alba
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- back leaf of rectus sheath
- Linea alba
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| function |
- one-sided: Lateral flexion of the trunk to the ipsilateral side, rotation of the trunk to the contralateral side
- two-sided: Ventral flexion of the trunk, alignment of the pelvis, abdominal press and expiration
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- one-sided: Lateral flexion of the trunk to the ipsilateral side, rotation of the trunk to the ipsilateral side
- two-sided: Ventral flexion of the trunk, alignment of the pelvis, abdominal press and expiration
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- one-sided: lateral flexion of the trunk to the ipsilateral side
- two-sided: abdominal press and expiration
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| innervation |
Nervi intercostales (Th5-12) |
- Nervi intercostales (Th8-12)
- Nn. iliohypogastricus and ilioinguinalis
- M. cremaster (R. genitalis of N. genitofemoralis)
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- Nervi intercostales (Th5-12)
- Nn. iliohypogastricus and ilioinguinalis
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Further links
Exercises
back to the trunk wall
