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Muscles Beginning With O
9 muscles in the reference begin with the letter O. Every name links to a page giving the muscle’s origin, insertion, main actions and nerve supply.
A B C D E F G H I L M N O P Q R S T V Z
| Muscle | Main actions | Nerve supply |
|---|---|---|
| Obliquus Capitis Inferior | Turns the face to the same side (rotates the atlas on the axis) | Suboccipital nerve (dorsal ramus of C1) |
| Obturator Externus | Rotates the thigh outward; Steadies the femoral head in its socket | Obturator nerve (L3–L4) |
| Obturator Internus | Rotates the thigh outward; Steadies the femoral head in its socket | Nerve to obturator internus (L5–S2) |
| Occipitalis | Pulls the scalp backwards | Facial nerve (CN VII), posterior auricular branch |
| Omohyoid | Depresses and steadies the hyoid bone | Ansa cervicalis (C1–C3) |
| Opponens Digiti Minimi | Cups the palm by drawing the fifth metacarpal forward | Ulnar nerve, deep branch (C8–T1) |
| Opponens Pollicis | Brings the thumb across the palm to meet the fingers (opposition) | Median nerve, recurrent branch (C8–T1) |
| Orbicularis Oculi | Closes the eyelids; Blinks and squints | Facial nerve (CN VII) |
| Orbicularis Oris | Closes the lips; Purses and protrudes the lips, as in kissing or whistling | Facial nerve (CN VII), buccal branch |
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.