The pyramidalis is a muscle of the anterior abdominal wall. It is a paired, triangular muscle, located superficial to the rectus abdominis.
- Attachments: Originates from the pubic crest and pubic symphysis before inserting onto the linea alba.
- Actions: Tenses the linea alba.
- Innervation: Subcostal nerve (T12).
- Blood supply: Inferior epigastric artery.
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Fig 1 – The pyramidalis muscle of the anterior abdominal wall.