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Foramen Magnum

Foramen Magnum is the largest foramen within the skull and centrally, in the deepest portion of the posterior cranial fossa.  It is surrounded anteriorly by the basilar part of the occipital bone, the lateral parts of the occipital bone on both side, and posteriorly by squamous part of the occipital bone.

Interactive Anatomical Interface

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nasal
Crista Galli
temporal bone
occipital bone
Internal auditory meatus
Stylomastoid Foramen
sphenoid bone
ethmoid bone
zygomatic bone
lacrimal bone
perpendicular plate
nasal cartilage
vomer
Nasal concha
Mandible
tectorial membrane of atlanto-axial joint
foramen magnum
tectorial membrane
Ethmoid sinuses
cribriform plate
Foramen rotundum
optic foramen
superior orbital fissure
palatine bone
Nuchal ligament
c1 atlas
c2 axis
c3 vertebrae
c4 vertebrae
c5 veretbrae
Posterior atlantoaxial ligament

Highlight
nasal
Crista Galli
temporal bone
occipital bone
Internal auditory meatus
Stylomastoid Foramen
sphenoid bone
ethmoid bone
zygomatic bone
lacrimal bone
perpendicular plate
nasal cartilage
vomer
Nasal concha
Mandible
foramen magnum

Highlight
tectorial membrane
tectorial membrane of atlanto-axial joint
Ethmoid sinuses
cribriform plate
Foramen rotundum
optic foramen
superior orbital fissure
palatine bone
Nuchal ligament
c1 atlas
c2 axis
c3 vertebrae
c4 vertebrae
c5 veretbrae
Posterior atlantoaxial ligament

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Foramen Magnum

Foramen Magnum

The spinal cord travels superiorly via the foramen magnum in order to proceed as the brainstem. The vertebral arteries, the meninges, as well as the spinal roots of the accessory nerve [XI], also travel via the foramen magnum.

Structure

Foramen magnum is divided into small anterior and large posterior compartments via alar ligaments of axis vertebra:

  1. Anterior compartment contains:
  • Apical ligament of dens.
  • Upper longitudinal band – the cruciform ligament of atlas.
  • Membrana tectoria, which is an extension of the posterior longitudinal ligament of the vertebral bodies.
  1. Posterior compartment contains:
  • Medulla oblongata along with its meninges that includes dura mater, arachnoid mater, along with pia mater.
  • Right and left posterior spinal arteries.
  • Anterior spinal artery.
  • Interacting veins among the internal vertebral venous plexus and the basilar venous plexus.
  • Two, right and left vertebral arteries.
  • Sympathetic plexus around the vertebral arteries containing postganglionic sympathetic fibres originated from the inferior cervical sympathetic ganglion.
  • Right and left spinal roots of two accessory nerves.

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By | 2018-03-12T07:00:52+00:00 February 14th, 2018|Anatomy, Areas, Head and Neck|0 Comments