Pyramidalis muscle

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The pyramidalis muscle is a small, triangular muscle located in the lower part of the abdomen. It is anterior to the rectus abdominis muscle and contained within the rectus sheath. The pyramidalis muscle is often absent, with studies showing it is missing in approximately 20% of the population.

Anatomy

The pyramidalis muscle originates from the pubic symphysis and the pubic crest. It inserts into the linea alba, a fibrous structure that runs down the midline of the abdomen. The muscle is innervated by the subcostal nerve (T12) and receives its blood supply from the inferior epigastric artery.

Function

The primary function of the pyramidalis muscle is to tense the linea alba. This action is thought to assist in the stabilization of the anterior abdominal wall.

Clinical significance

Due to its small size and variable presence, the pyramidalis muscle is not often implicated in clinical conditions. However, it may be encountered during surgical procedures involving the lower abdomen, and its presence or absence can be noted during such operations.

See also

• Rectus abdominis muscle
• Linea alba
• Rectus sheath
• Abdominal muscles

References

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