Foramen magnum
Basiläre
Impression als Zufallsbefund in der Computertomografie am ehesten auf der Basis einer rheumatoiden Arthritis. Beachte die Erweiterung des atlantodentalen Abstands mit der konsekutiven Einengung im Foramen magnum und Spinalkanal auf Höhe HWK 1 und 2.
Foramen
magnum • Skull base superior and inferior views (illustrations) - Ganzer Fall bei Radiopaedia
The foramen magnum is the largest foramen of the skull and is part of the occipital bone . It is oval in shape with a large anteroposterior diameter .
Gross anatomy
The foramen magnum is found in the most inferior part of the posterior cranial fossa . It is traversed by vital structures including the medulla oblongata . In the midline, the anterior margin is the basion and the posterior margin is the opisthion.
Relations
- anteriorly: basilar part of occipital bone
- anterolaterally: occipital condyles, hypoglossal canal, jugular foramen
- posteriorly: squamous part of occipital bone with the internal occipital crest
Contents
- medulla oblongata
- meninges
- spinal root of the accessory nerve
- vertebral arteries
- anterior and posterior spinal arteries
- tectorial membrane and alar ligaments
Radiographic features
CT
- at the level of the foramen magnum CSF is seen to surround the medulla which is reduced or absent in tonsillar herniation
Related pathology
- foramen magnum meningioma
- cerebral herniation
- chiari malformations
Siehe auch:
Assoziationen und Differentialdiagnosen zu Foramen magnum: 
