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Serratus Posterior Muscles: Origin, Insertion, Nerve Supply & Action

Serratus Posterior Muscles are-

Serratus Posterior Superior
Serratus Posterior Inferior

serratus posterior superior & inferior

Serratus Posterior Superior

The serratus posterior superior is lying deep to the rhomboid muscles on the upper back.
Attachments:
Origin: The lower part of the ligamentum nuchae, and the cervical and thoracic spines (usually C7 – T3).
Insertion: The fibers of the Serratus Posterior Superior pass in an inferolateral direction, attaching to ribs 2-5.

Nerve Supply: Intercostal nerves.

Actions: Elevates ribs 2-5.

Serratus Posterior Inferior

The serratus posterior inferior muscle is lies underneath the latissimus dorsi.

Attachments:
Origin: Originates from the thoracic and lumbar spines (usually T11 – L3).
Insertion: The muscle fibers pass in a superolateral direction, attaching to ribs 9-12.

Nerve Supply: Intercostal nerves.
Actions: Depresses thoracic ribs 9-12.

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