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Coccygeus Muscle
Muscular System

Coccygeus Muscle

Musculus coccygeus

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Quick Facts

Origin: Ischial spine.

Insertion: Anterolateral aspects of sacrum and coccyx.

Action: Provides structural support to adjacent pelvic structures.

Innervation: Anterior rami of fourth and fifth sacral nerves (S4-S5).

Arterial Supply: Inferior gluteal artery.

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Origin

The coccygeus muscle originates from the ischial spine.

Insertion

The fibers of the coccygeus muscle travel posteromedially and insert, via a broad tendon, onto the:

- anterolateral aspect of the inferior area of the sacrum;

- anterolateral aspect of the superior area of the coccyx.

Key Features & Anatomical Relations

The coccygeus (ischiococcygeus) muscle is one of the muscles of the pelvic diaphragm. It is a flat, triangular skeletal muscle that forms the posterosuperior part of the pelvic diaphragm. It is located:

- anterior to the sacrospinous ligament, which it may also be attached to;

- superior to the iliococcygeus muscle of the levator ani;

- inferior to the piriformis muscle.

Actions

As part of the pelvic diaphragm, the coccygeus muscle provides structural support to adjacent pelvic structures (Sinnatamby, 2011).

List of Clinical Correlates

- Prolapse of pelvic viscera

- Urinary incontinence

- Fecal incontinence

References

Sinnatamby, C. S. (2011) Last's Anatomy: Regional and Applied. ClinicalKey 2012: Churchill Livingstone/Elsevier.

Actions

As part of the pelvic diaphragm, the coccygeus muscle provides structural support to adjacent pelvic structures (Sinnatamby, 2011).

Learn more about this topic from other Elsevier products

Coccygeus Muscle

ScienceDirect image

The coccygeus muscle also arises from the ischial spine and likewise inserts on the sacrum and coccyx.

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Complete Anatomy

The world's most advanced 3D anatomy platform

Complete Anatomy