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Foramen Magnum: Difference between revisions
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[[File:Crane4 Foramen magnum.png|thumb|Foramen Magnum]] | [[File:Crane4 Foramen magnum.png|thumb|Foramen Magnum]] | ||
The [[Foramen Magnum]] (Latin: great hole) is a large oval opening (foramen) in the occipital bone of the skull in humans and various other animals. It is one of the several oval or circular openings (foramina) in the base of the skull. The spinal cord, an extension of the | The function of the [[Foramen Magnum]] is to allow nerves, blood vessels and fluid to pass in and out of the brain. The [[Foramen Magnum]] is a large hole at the base of the skull. The [[Brain]] stem is essentially seated in the [[Foramen Magnum]] and lying on the basi-occiput. It can be subject to structural pressures that generate misalignment for a variety of different reasons. | ||
The [[Foramen Magnum]] (Latin: great hole) is a large oval opening (foramen) in the occipital bone of the skull in humans and various other animals. It is one of the several oval or circular openings (foramina) in the base of the skull. The spinal cord, an extension of the [[Medulla Oblongata]], passes through the foramen magnum as it exits the cranial cavity. | |||
Apart from the transmission of the [[Medulla Oblongata]] and its membranes, the foramen magnum transmits the vertebral arteries, the anterior and posterior spinal arteries, the tectorial membranes and alar ligaments. It also transmits the spinal component of the accessory nerve into the skull.<ref>[https://en.wikipedia.org/wiki/Foramen_magnum Foramen Magnum]</ref> | Apart from the transmission of the [[Medulla Oblongata]] and its membranes, the foramen magnum transmits the vertebral arteries, the anterior and posterior spinal arteries, the tectorial membranes and alar ligaments. It also transmits the spinal component of the accessory nerve into the skull.<ref>[https://en.wikipedia.org/wiki/Foramen_magnum Foramen Magnum]</ref> | ||
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In anatomy, the atlas (C1) is the most superior (first) cervical vertebra of the spine. It is named for the Atlas of Greek mythology, because it supports the globe of the head which is the skull. The atlas is the topmost vertebra and with the axis forms the joint connecting the skull and spine. The atlas and axis are specialized to allow a greater range of motion than normal vertebrae. They are responsible for the nodding and rotation movements of the head. | In anatomy, the atlas (C1) is the most superior (first) cervical vertebra of the spine. It is named for the Atlas of Greek mythology, because it supports the globe of the head which is the skull. The atlas is the topmost vertebra and with the axis forms the joint connecting the skull and spine. The atlas and axis are specialized to allow a greater range of motion than normal vertebrae. They are responsible for the nodding and rotation movements of the head. | ||
The atlanto-occipital joint allows the head to nod up and down on the vertebral column. The dens acts as a pivot that allows the atlas and attached head to rotate on the axis, side to side. The atlas's chief peculiarity is that it has no body. It is ring-like and consists of an anterior and a posterior arch and two lateral masses. The atlas and axis are important neurologically because the brain stem extends down to the axis. <ref>[https://en.m.wikipedia.org/wiki/Atlas_(anatomy) Atlas</ref> | The atlanto-occipital joint allows the head to nod up and down on the vertebral column. The dens acts as a pivot that allows the atlas and attached head to rotate on the axis, side to side. The atlas's chief peculiarity is that it has no body. It is ring-like and consists of an anterior and a posterior arch and two lateral masses. The atlas and axis are important neurologically because the brain stem extends down to the axis. <ref>[https://en.m.wikipedia.org/wiki/Atlas_(anatomy) Atlas]</ref> | ||
==C1 Atlas Vertebrae== | ==C1 Atlas Vertebrae== | ||
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[[CNS]] | [[CNS]] | ||
[[Thalamus]] | |||