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External occipital protuberance: magnified reference view with a numbered learning marker. The complete original plate is available in the next view.
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External occipital protuberance

Midline projection on the posterior external occipital surface. Related to the superior nuchal lines. Its most prominent point is termed inion.

Zoom in, then drag to inspect. Keyboard: + / − to zoom, arrows to pan, 0 to reset. Tap the numbered markers to explore parts.

External occipital protuberance: magnified reference view with a numbered learning marker. The complete original plate is available in the next view.

Image: OpenStax College / university open textbook · Source / original · CC BY 4.0

Numbered markers and focused views are Mediveerse learning overlays; the original reference is linked above.

External occipital protuberance

Skull-base landmarks

External occipital protuberance

STRUCTURE & FUNCTION

Understand what you see.

Midline projection on the posterior external occipital surface.

Zoom into the original labels. Practise pointing out each structure, then explain it aloud. Diagrams are teaching references; specimen appearance and slide staining vary.

01 / IDENTIFICATION

How to recognise it.

  1. Midline projection on the posterior external occipital surface
  2. Related to the superior nuchal lines
  3. Its most prominent point is termed inion
02 / KEY STRUCTURES

Point them out.

Tap a number to open its reference, zoom in and locate the structure. Numbers stay the same across views. This key follows landmarks visible in the reference images.

Related features & study points (3)

Additional relations, attachments or microscopic details to revise alongside this plate. These are separate from its numbered image landmarks.

  • Inion
  • Superior nuchal lines
  • Nuchal ligament
03 / VIVA PRACTICE

Think first. Then reveal.

Say your answer aloud before opening the suggested response.

Examiner-style prompts: identify the structure, explain its relations, then answer the applied follow-up. These are revision questions, not authenticated past papers.

01Identify external occipital protuberance and justify your identification.
SUGGESTED ANSWER

Midline projection on the posterior external occipital surface. Related to the superior nuchal lines. Its most prominent point is termed inion.

02Which ligament attaches in this region?
SUGGESTED ANSWER

The nuchal ligament.

03Is inion the same as bregma?
SUGGESTED ANSWER

No. Inion is posterior occipital; bregma is the coronal–sagittal suture junction on the vault.

Read the references.

Credited anatomical plates, microscopy and university teaching references. Individual image credits appear below the viewer. Historical plates can use older terminology; use the lesson text for current names.