Lumbar iliocostal muscle

About the lumbar iliocostal muscle of the dog

Lumbar iliocostal muscle is a muscle of the spine (vertebral column), on the left side. Its name in the Nomina Anatomica Veterinaria is Musculus iliocostalis lumborum. You can turn it above, see it in place in the spine of the dog, and open it inside the whole animal in Vetomica.

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

Iliac crest and the inner face of the iliac wing.

Insertion

Lumbar transverse processes and the caudal edges of the last few ribs.

Action

Stabilises the loin, bends it laterally on one side, and pulls the last ribs back in expiration.

Nerve

Dorsal branches of the lumbar and caudal thoracic spinal 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
• Lumbar vertebrae
• Rib 13

Muscles and ligaments it works with

• Thoracic iliocostalis muscle
• Longissimus lumborum
• Caudal dorsal serrate muscle
• Transversus abdominis
• Internal oblique muscle of the abdomen

Terminology

English

Lumbar iliocostal muscle

Latin (NAV)

Musculus iliocostalis lumborum

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 trunk (epaxial muscles)
• Dyce, Sack & WensingThe neck, back and vertebral column of the dog and cat
• Miller 2020 (book pass)ch. 6 The Muscular System, PDF p. 514

The lumbar iliocostal muscle in other animals

The same structure in the other animals in the Library, to compare.

• Lumbar iliocostal muscle of the horse

Questions about the lumbar iliocostal muscle

What is the Latin name of the lumbar iliocostal muscle?

In the Nomina Anatomica Veterinaria, the lumbar iliocostal muscle is called Musculus iliocostalis lumborum.

Where is the lumbar iliocostal muscle of the dog?

Lumbar iliocostal muscle is a muscle of the spine (vertebral column), on the left side.

Which bones does the lumbar iliocostal muscle attach to?

Lumbar iliocostal muscle takes hold of Ilium, Lumbar vertebrae and Rib 13.

Where does the lumbar iliocostal muscle originate and insert?

Origin: Iliac crest and the inner face of the iliac wing. Insertion: Lumbar transverse processes and the caudal edges of the last few ribs.

What nerve supplies the lumbar iliocostal muscle?

Dorsal branches of the lumbar and caudal thoracic spinal nerves.

What does the lumbar iliocostal muscle do?

Stabilises the loin, bends it laterally on one side, and pulls the last ribs back in expiration.