foramen magnum


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foramen magnum

n.
The large orifice in the base of the skull through which the spinal cord passes to the cranial cavity and becomes continuous with the medulla oblongata.

[New Latin forāmen magnum : Latin forāmen, opening + Latin magnus, large.]

foramen magnum

n
(Anatomy) the large opening at the base of the skull through which the spinal cord passes
[New Latin: large hole]

fora′men mag′num

(ˈmæg nəm)
n.
the large opening in the base of the skull through which the spinal cord merges with the brain.
[1880–85; < New Latin: literally, large hole]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.foramen magnum - the large opening at the base of the cranium through which the spinal cord passesforamen magnum - the large opening at the base of the cranium through which the spinal cord passes
braincase, brainpan, cranium - the part of the skull that encloses the brain
foramen, hiatus - a natural opening or perforation through a bone or a membranous structure
References in periodicals archive ?
tragocamelus; temporal fossa relatively slightly shorter; occipital less convex transversely over the foramen magnum and less hollowed on either side of the median vertical line; occipital condyles much wider and projecting farther in rear of the occipital crest; foramen magnum much larger; paraoccipital process less compressed laterally" (Pilgrim, 1939).
The foramen magnum, Latin for "great opening", is an aperture in the occipital bone of the skull and the largest of the skull's foramina (Fig.
Posteroinferiorly, the lesion is infiltrating the foramen magnum with associated obliteration of anterior thecal sac space and significant extradural compression of the cervicomedullary region of the brain stem, which is seen pushed to the left.
It ascents through foramina transversaria of all six cervical vertebrae and enters into cranial cavity through foramen magnum to supply different part of the brain after the formation of a circle of Willis.
Titled "Another look at the foramen magnum in bipedal mammals," (http://www.
No Anatomical landmarks definitions 1 Minimum frontal breadth Distance between the two frontotemporale (ft) 2 Biorbital breadth Distance between right and left ectoconchion (ec) 3 Bizygomatic diameter Distance between most lateral points on the zygomatic arches 4 Nasal breadth Maximum breadth of the nasal aperture 5 Orbital height Distance between the superior and inferior orbital margins 6 Foramen magnum breadth Distance between the lateral margins of foramen magnum at the points of greatest lateral curvature 7 Foramen magnum length Distance from basion (ba) to opisthion (o) 8 Foramen ovale Distance between left and right of foramen ovale 9 Foramen spinosum Distance between left and right of foramen spinosum Table 4: Dimensional measurements of dry skull and CAD models.
Fifty nine of these were done for 4th ven-tricle/cerebellar sols, twelve for foramen magnum SOLs, and six for chiari malformations.
sup][2],[4] They mostly locate in the prepontine region, rarely in the intrasellar, suprasellar, pterional region, pineal, dorsum sellae, Meckel's cave, cerebellum, hypothalamus, tentorium cerebella, and foramen magnum.
In this skull, median or third occipital condyle is seen along the anterior margin of foramen magnum.
Lymphoplasmacyte-rich meningioma at the foramen magnum.
1 There was a time when lots of scholars acknowledging the crowding theory which postulated that restricted growth of the posterior fossa causes compression of neural tissue, which is then squeezed through the foramen magnum like toothpaste through a tube.