foramen magnum

Definitions

  • WordNet 3.6
    • n foramen magnum the large opening at the base of the cranium through which the spinal cord passes
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Chambers's Twentieth Century Dictionary
    • Foramen magnum the great hole in the occipital bone for the passage of the medulla oblongata and its membranes
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Etymology

Chambers's Twentieth Century Dictionary
L.,—forāre, to pierce.

Usage

In literature:

F.M., or f.m., foramen magnum.
"Text Book of Biology, Part 1: Vertebrata" by H. G. Wells
Sudden death may occur from crowding of the cerebellum into the foramen magnum.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition." by Alexander Miles
The exoccipitals extend around the sides of the foramen magnum and meet dorsally.
"A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America)" by John Wellman
The foramen magnum is more triangular.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard
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