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Topic

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Intrabiventral Fissure of Biventral Lobule

The intrabiventral fissure is a shallow groove separating the two hemispheric divisions of the biventral lobule of the cerebellum. It lies within the inferior portion of the cerebellar hemisphere, forming part of the cerebellar surface anatomy that demarcates distinct lobular compartments. This fissure is composed of narrow cortical invaginations lined by gray matter and allows passage of small cerebellar veins and superficial cerebellar white matter tracts.

The fissure contributes to the overall surface morphology of the cerebellum, aiding in lobular segmentation for motor coordination and fine movement control. Its recognition is important in neuroimaging, surgical planning, and cerebellar lesion localization.

Function

  • Separates the two hemispheric divisions of the biventral lobule

  • Maintains cerebellar lobular organization

  • Provides landmarks for surgical orientation and neuroimaging

  • Plays a role in coordination of motor and cognitive cerebellar functions

Synonyms

  • Intrabiventral sulcus

  • Cerebellar biventral fissure

  • Fissura intrabiventralis

MRI Appearance

T1-weighted images:

  • Appears as a thin hypointense line separating the slightly hyperintense gray matter of the biventral lobule

  • Surrounded by intermediate to high signal cerebellar white matter, providing natural contrast

  • Pathological changes such as hemorrhage, edema, or mass effect can alter its normal appearance

T2-weighted images:

  • The fissure is low to intermediate signal, delineating adjacent gray matter

  • Surrounding white matter shows higher signal, highlighting the fissure clearly

  • Useful for identifying cerebellar cortical atrophy, demyelination, or focal lesions

STIR (Short Tau Inversion Recovery):

  • Fissure itself remains low signal, while edema or inflammation in surrounding tissue appears hyperintense

  • Valuable for detecting cerebellar infarction, gliosis, or acute pathology

T1 Post-Contrast (Gadolinium-enhanced):

  • Normally, the fissure does not enhance, except for the vascular structures within it

  • Abnormal enhancement may indicate tumor infiltration, vascular malformation, or inflammatory pathology

CT Appearance:

  • Appears as a thin, linear groove within the cerebellar cortex

  • Cerebellar gray matter is slightly hyperdense relative to surrounding white matter

  • CT is less sensitive than MRI for the fissure itself but can detect calcifications, hemorrhage, or mass effect affecting its contours

MRI images

Intrabiventral fissure of Cerebellum mri sag image -img-00000-00000