Internal oblique muscle of the abdomen
Musculus obliquus internus abdominis
Compresses the abdomen and flexes the trunk. Its fibres run cranioventrally, crossing those of the external oblique.
- System
- Muscle
- Region
- Abdomen
- Sides
- Paired: left and right
Where it runs from and to
A muscle is told apart from its neighbours by what it takes hold of at each end, which is also what decides what it does when it shortens.
- Origin
- Tuber coxae, the inguinal ligament and the thoracolumbar fascia.
- Insertion
- Last rib, the costal arch and the linea alba by an aponeurosis.
- Action
- Compresses the abdomen and flexes the trunk. Its fibres run cranioventrally, crossing those of the external oblique.
- Nerve
- Ventral branches of the caudal thoracic and the lumbar nerves.
Written for Vetomica in its own words from the standard reference anatomy of the dog; the books it was checked against are listed below.
What it works on
Bones it takes hold of
- Ilium
- Rib 13
- Costal arch
Muscles and ligaments it works with
- Linea alba
- Inguinal ligament
- External abdominal oblique muscle
- Transversus abdominis
- Rectus abdominis muscle
- Cremaster
- Iliocostalis lumborum
Terminology
- English
- Internal oblique muscle of the abdomen
- Latin (NAV)
- Musculus obliquus internus abdominis
- Status
- A valid term in the Nomina Anatomica Veterinaria
References
Where to read this structure in full, and where the named parts above were read.
- NAV 2017Myologia
- Miller's Anatomy of the Dog, 5th ed.The Muscular System: muscles of the abdominal wall
- Dyce, Sack & WensingThe abdomen of the dog and cat
- Miller 2020 (book pass)ch. 6 The Muscular System, PDF p. 536