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Intraculminate fissure

The intraculminate fissure is a shallow groove located on the superior surface of the cerebellum, specifically within the anterior lobe. It separates the lingula (lobule I) from the central lobule (lobule II), and more commonly, it is considered to demarcate the anterior border of the culmen (lobule IV) from the central lobule. It is an important anatomical landmark in cerebellar morphology and plays a key role in dividing the folia of the superior vermis. Its identification aids in neuroanatomical orientation during neuroimaging and neurosurgical procedures.

Synonyms:

  • Fissura intraculminata (Latin)

  • Intraculminate sulcus

Arterial Supply:

  • Supplied primarily by the superior cerebellar artery (SCA), a branch of the basilar artery.

  • Additional minor contributions from the anterior inferior cerebellar artery (AICA) may occur depending on vascular variations.

Venous Supply:

  • Drained mainly by the superior cerebellar veins, which empty into the straight sinus or great cerebral vein (vein of Galen).

  • Additional drainage may occur via the precentral cerebellar vein.

Function:

  • The intraculminate fissure itself does not have a direct function but serves as an anatomical landmark.

  • Regions it separates (culmen and central lobule) are involved in the coordination of voluntary motor movement, postural control, and fine motor adjustments.

  • Plays a role in distinguishing between different functional regions of the cerebellar cortex.

MRI Appearance:

  • Appears as a thin, hypointense (dark) line separating the superior folia of the vermis and anterior lobe on T1- and T2-weighted images.

  • Best visualized in mid-sagittal and parasagittal slices.

  • Aids in identifying lobules and sublobules of the superior cerebellum, especially in high-resolution 3D MRI sequences.

CT Appearance:

  • The fissure is not usually well visualized on routine CT due to its fine structure and the limited soft-tissue contrast of CT.

  • In cases of significant cerebellar atrophy or edema, the fissure may appear as a faint hypodense (dark) groove between denser cerebellar folia.

  • Identification is best attempted in thin-slice, high-resolution CT or in the context of gross cerebellar pathology.

MRI images

Intraculminate fissure MRI 3T axial image

MRI images

Intraculminate fissure MRI 3T sagittal image

MRI images

Intraculminate fissure MRI 3T sagittall image

MRI images

Intraculminate fissure mri coronal 3t image

CT image

Intraculminate fissure CT sag anatomy image -img-00001-00001