Dog · Muscle · Abdomen
External abdominal oblique muscle
Musculus obliquus externus abdominis
Compresses the abdomen, flexes the trunk, and takes part in expiration and straining. Its fibres run caudoventrally.
- System
- Muscle
- Region
- Abdomen
- Sides
- Paired: left and right
- Named parts
- 2
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
- Lateral surfaces of the fourth or fifth rib back to the last, and the thoracolumbar fascia.
- Insertion
- Linea alba, the tuber coxae and the prepubic tendon by a broad aponeurosis.
- Action
- Compresses the abdomen, flexes the trunk, and takes part in expiration and straining. Its fibres run caudoventrally.
- 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.
Named parts
The parts of this muscle the books name separately, and what each is called in the Nomina Anatomica Veterinaria.
- Costal part
- The part arising from the ribs, whose fibres run down and back across the chest wall.Miller 2020, p. 532
- Lumbar part
- The part arising behind the last rib from the thoracolumbar fascia.Miller 2020, p. 532
What it works on
Bones it takes hold of
- Ribs
- Rib 13
Muscles and ligaments it works with
- Linea alba
- Prepubic tendon
- Inguinal ligament
- Obliquus internus abdominis
- Rectus abdominis muscle
- Cutaneus trunci
- Latissimus dorsi
- Serratus ventralis thoracis
- Deep pectoral muscle
- Scalenus dorsalis
- Serratus dorsalis caudalis
Terminology
- English
- External abdominal oblique muscle
- Latin (NAV)
- Musculus obliquus externus 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. 533