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Levatores Costarum (Left)
Muscular System

Levatores Costarum (Left)

Levatores costarum

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Quick Facts

Origin: Transverse processes of C7-T11 vertebrae.

Insertion: Superior borders and external surfaces of first to twelfth ribs.

Action: Elevate ribs at their costovertebral joints.

Innervation: Lateral branches of posterior rami of thoracic nerves.

Arterial Supply: Dorsal branches of posterior intercostal arteries.

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Origin

The levatores costarum muscles originate from the tips of the transverse processes of the seventh cervical and first to eleventh thoracic vertebrae.

Insertion

The fibers of the levatores costarum muscles travel inferolaterally to insert onto the first or second rib that is inferior to their origin sites (i.e., the first to twelfth ribs). They insert onto the superior borders and external surfaces of these ribs, in the area located between their tubercles and angles.

Key Features & Anatomical Relations

The levatores costarum (levator costae) muscles are a group of muscles of the thorax. They are composed of many individual muscles that are classified as belonging to either the:

- levatores costarum breves muscles, which are composed of muscles that insert onto the first rib that is inferior to their origin sites;

- levatores costarum longi muscles, which are composed of muscles that insert onto the second rib that is inferior to their origin sites.

The levatores costarum muscles are located:

- superficial to the external intercostal muscles;

- deep to the longissimus muscle;

- lateral to the transversospinal and thoracic intertransversarii muscles.

Actions

The levatores costarum muscles elevate the ribs at their costovertebral joints (Netter, 2011).

References

Netter, F. H. (2011) Atlas of Human Anatomy. Netter Basic Science Series: Saunders/Elsevier.

Actions

The levatores costarum muscles elevate the ribs at their costovertebral joints (Netter, 2011).

Complete Anatomy

The world's most advanced 3D anatomy platform

Complete Anatomy