abdominal internal oblique muscle

abdominal internal oblique

The lateral abdominal wall muscle that is deep to the external oblique and superficial to the transversus.

Type Muscle
Parent Structure abdominal oblique muscle
Latin Name abdominal internal oblique
FMA ID 13891

Frequently Asked Questions

What is the abdominal internal oblique muscle?
The abdominal internal oblique muscle (abdominal internal oblique) is one of the three flat muscles of the lateral abdominal wall. It lies deep to the external oblique and superficial to the transversus abdominis, forming the middle layer of the lateral abdominal wall.
Where is the abdominal internal oblique muscle located?
The internal oblique is located on the lateral and anterior abdominal wall, between the external oblique on the outside and the transversus abdominis on the inside. Its fibers run obliquely upward and medially from the iliac crest and inguinal ligament to the lower ribs and the linea alba.
What is the function of the abdominal internal oblique muscle?
The internal oblique flexes and rotates the trunk, compresses the abdominal contents, and assists with forced expiration. When acting with the contralateral external oblique, it produces ipsilateral rotation of the trunk.
What conditions can affect the abdominal internal oblique muscle?
The internal oblique can be strained during sports involving twisting or rapid directional changes. It is also relevant in hernia repair surgery, as the internal oblique forms part of the inguinal canal's posterior wall and its integrity influences hernia recurrence rates.
How is the internal oblique different from the external oblique?
The external oblique lies superficially and its fibers run downward and medially, while the internal oblique is deep to it with fibers running roughly perpendicular. Together, their opposing fiber directions create a strong, tension-resistant wall around the abdomen.

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Educational Disclaimer

This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for medical decisions.

Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.