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Coccygeus (Ischiococcygeus)

Region

Origin & Insertion

Origin: Ischial spine; Insertion: Lower sacrum and coccyx

Synergistic Muscles

Levator ani

Joints

Sacroiliac/coccygeal support

Primary Actions

Supports pelvic floor and coccyx, flexes coccyx

Nerve & Spinal Segment

Branches of S4 and S5 spinal nerves

Sacral plexus; S4–S5

Interesting

Fibrous and muscular blend; stabilizes tailbone. [Gray’s]

Reversal of Action

Lift tailbone via posterior pelvic tilt

Common Dysfunctions

Tailbone pain, pelvic floor instability

How to Stretch

Child’s pose with tailbone tuck

Trigger Points

How to Strengthen

Tailbone awareness with pelvic floor lifts

Concentric Action

Stabilize coccyx during pelvic motion

Applications:

Targets tailbone pain and supports sacral mobility

Eccentric Action

Control coccyx recoil

Isotonic Action

Deep core breath with coccyx cue

Related Conditions

Pelvic trauma, falls onto sacrum

Isometric Action

Maintain coccygeal tension during breath hold

Exercise Ideas

Posture, Core Stability, Pelvic Support

Spry Juncture, LLC

How to Evolve Gracefully