• Jugular foramen

• 
  Animation. Occipitomastoid suture shown in red.
• 
  Temporal bones and occipital bone, seen from inside.
• 
  Base of skull. Inferior surface.
• 
  Base of skull. Inferior surface.

This article incorporates text in the public domain from page 183 of the 20th edition of Gray's Anatomy (1918)

Wikimedia Commons has media related to Occipitomastoid sutures.

• "Anatomy diagram: 34256.000-2". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2013-06-11.
• "Anatomy diagram: 34257.000-1". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2012-07-22.
• "Anatomy diagram: 34257.000-2". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2013-06-22.