Pyramidalis muscle - Female abdomen-pelvis CT - Axial - e-Anatomy
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Pyramidalis muscle

Musculus pyramidalis

  • Related terms: Pyramidalis

Definition

Muhammad A. Javaid

Pyramidalis muscle

Origin

Pubic crest and pubic symphysis

Insertion

Linea alba

Innervation

Subcostal nerve (T12)

Action

Tensing the linea alba

The pyramidalis muscle is a small triangular muscle located in the lower part of the anterior abdominal wall, lying anterior to the inferior part of the rectus abdominis muscle within the rectus sheath.

Attachments

The pyramidalis muscle originates from the pubic crest and pubic symphysis and inserts into the linea alba.

Innervation

The muscle is supplied by the subcostal nerve (T12).

Function

Its main function is to tense the linea alba.

---- Pyramidalis is absent in some individuals (either on one side or both) and is considered a vestigial muscle with minor functional importance.

Is this definition incorrect or incomplete?

References

  • Das SS, Saluja S, Vasudeva N. Biometrics of Pyramidalis Muscle and its Clinical Importance. J Clin Diagn Res. 2017 Feb;11(2):AC05AC07.

  • Varacallo MA, Scharbach S, AlDhahir MA. Anatomy, Anterolateral Abdominal Wall Muscles. [Updated 2023 Jul 24]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan. Available from: https://www.ncbi.nlm.nih.gov/books/NBK470334/

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