The frontal crest of the frontal bone ends below in a small notch which is converted into a foramen, the foramen cecum (or foramen caecum), by articulation with the ethmoid.

The foramen cecum varies in size in different subjects, and is frequently impervious; when open, it transmits the emissary vein from the nose to the superior sagittal sinus. This has clinical importance in that infections of the nose and nearby areas can be transmitted to the meninges and brain from what is known as the danger triangle of the face.

• Sagittal section of the skull, showing the sinuses of the dura.
• Photo with foramina of skull labeled. Foramen cecum is labeled at the top right.
• Foramen cecum
• Foramen cecum

• Foramina of skull

This article incorporates text in the public domain from page 137 of the 20th edition of Gray's Anatomy (1918)

• Anatomy image: skel/internal2 at Human Anatomy Lecture (Biology 129), Pennsylvania State University look for #2
• "Anatomy diagram: 34257.000-2". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2013-06-22.

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