Cisterna magna

The cisterna magna (also known as the cerebellomedullary cistern) is the largest of the CSF-filled subarachnoid cisterns.

Gross anatomy

The cisterna magna is located between the cerebellum and the dorsal surface of the medulla oblongata at and above the level of the foramen magnum. CSF produced in the ventricular system drains into the cisterna magna from the fourth ventricle via the median aperture (of Magendie) and the lateral apertures (of Luschka) .

Several vessels and nerves course through the lateral part of the cistern:

Radiographic features

Antenatal ultrasound
  • cisterna magna normally measures between 2-10 mm in the second and third trimesters
  • cisterna magna normally measures 3-8 mm in the midsagittal plane when measured from the posterior margin of the foramen magnum to the caudal margin of the inferior vermis

Variant anatomy

Siehe auch:
und weiter: