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Tuber of vermis (VII)

The tuber of vermis is the posteriorly projecting lobule of the cerebellar vermis, corresponding to lobule VII in Larsell’s classification. It forms part of the posterior lobe of the cerebellum, lying inferior to the Folium (VII) and superior to the pyramid (lobule VIII). On the cerebellar surface, the tuber contributes to the convex dorsal contour of the vermis.

It is composed of gray matter (cerebellar cortex) with underlying white matter from the arbor vitae, and its main role is associated with cerebellar coordination of posture, balance, and fine motor control. The tuber is a recognizable landmark in posterior fossa imaging and may be involved in congenital malformations, tumors, or degenerative cerebellar disorders.

Synonyms

  • Vermian lobule VII

  • Cerebellar tuber

  • Tuber vermis

  • Lobule VII of vermis

Function

  • Coordinates postural stability and balance

  • Contributes to fine motor control via cerebellar connections

  • Involved in sensorimotor integration of axial and proximal muscles

  • Plays a role in higher-order motor timing and coordination as part of the posterior lobe circuitry

MRI Appearance

T1-weighted images:

  • The tuber appears as low to intermediate signal cortex with higher signal white matter arbor vitae beneath.

  • Provides clear contrast between gray and white matter layers.

  • Pathology (atrophy, tumor, demyelination) alters normal vermian architecture and signal.

T2-weighted images:

  • Cortical gray matter appears intermediate to slightly hyperintense, while underlying white matter is hypointense, giving a clear laminar appearance.

  • Useful for detecting edema, atrophy, or infiltrative lesions.

STIR (Short Tau Inversion Recovery):

  • Gray matter and white matter differentiation is preserved.

  • Pathological changes such as edema, demyelination, or gliosis show hyperintense signal, while normal cortex remains intermediate.

T1 Post-Contrast (Gadolinium-enhanced):

  • Normal tuber does not enhance.

  • Abnormalities such as tumors (medulloblastoma, ependymoma, metastasis) or inflammatory lesions may show variable enhancement patterns.

CT Appearance:

  • The tuber is visible as part of the posterior vermis, appearing as isodense gray matter relative to adjacent cerebellar cortex.

  • White matter arbor vitae appears slightly hypodense, helping outline lobular architecture.

  • CT is useful for evaluating posterior fossa masses, hemorrhage, calcifications, and congenital anomalies (e.g., Dandy–Walker malformation).

MRI images

Tuber of Vermis (Lobule VII) of Cerebellum mri sag image -img-00000-00000