Inion

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The inion is an important superficial anatomical landmark and is defined as the most dorsal point of the skull.

Anatomy

The inion is located at the Protuberantia occipitalis externa, which is formed by a bony prominence of the Os occipitale.

Figure

Anatomical landmarks in the lateral view of the skull
Anatomical landmarks in the lateral view of the bony skull. Figure adapted from Takanori Fukushima, Manual of Skull Base Dissection, 3rd Edition. ISBN: 9780965198615.

Imaging

Inion of the skull
Visualization of the inion (red circle) using a CT reconstruction of the human skull.

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