Pyramidalis
Musculus pyramidalis
The pyramidalis is a small, triangular muscle lying in front of the lower rectus abdominis, inside the rectus sheath; it is absent in roughly 20% of people. Its only action is to tense the linea alba, the fibrous midline seam of the abdominal wall. It has negligible direct training relevance but is part of the anterior abdominal wall complex.
- Actions
- Tenses the linea alba
- Origin
- Pubic crest and pubic symphysis
- Insertion
- Linea alba
- Innervation
- Subcostal nerve (T12)
- Blood supply
- Inferior epigastric artery
Synergists Rectus Abdominis
Tendons Linea AlbaRectus Sheath