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Folium (VII) of Cerebellum

The folium (lobule VII) of the cerebellum is part of the posterior vermis, located between the tuber (lobule VIIB) and the declive (lobule VI). It forms a narrow, leaf-like lobule that contributes to the superior posterior vermis. Like other vermian structures, the folium is composed of cerebellar cortex (gray matter), underlying white matter, and deep cerebellar connections. It participates in coordination of motor control, posture, and fine-tuned voluntary movements, integrating signals from the cerebral cortex, spinal cord, and vestibular system.

The folium, along with neighboring lobules, is also linked to cognitive and affective processing through cerebellar-cortical connections, reflecting the cerebellum’s role beyond motor regulation.

Synonyms

  • Folium vermis (lobule VII)

  • Folium of vermis

  • Cerebellar folium

  • Vermian folium

Function

  • Contributes to coordination of voluntary motor activity

  • Assists in postural control and balance

  • Integrates vestibular, proprioceptive, and cortical inputs for smooth motor execution

  • Plays a role in cognitive and affective cerebellar networks

MRI Appearance

T1-weighted images:

  • Folium appears as low signal intensity (gray matter) cortex surrounding high signal white matter core, producing the classic arbor vitae pattern of the cerebellum

  • Vermian folia are clearly demarcated in sagittal and coronal sections

T1 Post-Contrast (Gadolinium-enhanced):

  • Normal folium does not enhance

  • Pathological conditions (tumor, inflammation, demyelination) may show abnormal focal or diffuse enhancement

T2-weighted images:

  • Gray matter of the folium is intermediate to hypointense relative to the bright cerebrospinal fluid (CSF) in the fourth ventricle and cisterns

  • White matter core appears relatively hyperintense compared to cortex, highlighting folial boundaries

  • Useful for evaluating edema, infarcts, or demyelination

STIR (Short Tau Inversion Recovery):

  • Folium cortex remains intermediate to low signal

  • Edema, demyelination, or gliosis within the folium appear hyperintense, making STIR useful for early pathological detection

CT Appearance:

  • Folium appears as soft tissue density within the posterior fossa

  • The cortex and white matter are not distinguished as clearly as on MRI

  • Posterior fossa bone can obscure fine folial detail, but CT is useful for detecting hemorrhage, calcifications, and mass effect

  • Cerebellar folia can be visualized in high-resolution thin-section CT, though MRI is preferred for detailed evaluation

MRI images

Folium (VII) of Cerebellum mri sag image -img-00000-00000