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foramen magnum

American  
[mag-nuhm] / ˈmæg nəm /

noun

Anatomy.
  1. the large opening in the base of the skull forming the passage from the cranial cavity to the spinal canal.


foramen magnum British  

noun

  1. the large opening at the base of the skull through which the spinal cord passes

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of foramen magnum

1880–85; < New Latin: literally, great hole

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Openings here include the large foramen magnum, plus the internal acoustic meatus, jugular foramina, and hypoglossal canals.

From Textbooks • Jun. 19, 2013

The vertebral artery passes through the vertebral foramen in the cervical vertebrae and then through the foramen magnum into the cranial cavity to supply blood to the brain and spinal cord.

From Textbooks • Jun. 19, 2013

One clue is a tiny fragment of the foramen magnum, the opening at the base of the skull where the spinal cord joins the brain: its location suggests an upright stance.

From Time Magazine Archive

Tympanic bulla smaller than foramen magnum; hind foot more than 74; geographic range wholly in United States.

From A Synopsis of the North American Lagomorpha by Hall, E. Raymond (Eugene Raymond)

On the other hand, an adult animal of pigmy size might be expected to have large orbits, large otic capsules and a large foramen magnum.

From A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas by Eaton, Theodore H. (Theodore Hildreth)

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