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Declive (VI) of Cerebellum

The Declive (VI) is a central lobule of the superior posterior lobe of the cerebellum, situated anterior to the folium of the vermis (Vermis VI) and posterior to the simple lobule (Lobule V). It forms part of the vermis, which is the midline structure connecting the two cerebellar hemispheres. The Declive is involved in coordination of trunk and limb movements, postural control, and integration of vestibular and proprioceptive information.

The lobule is composed of gray matter cortex overlying cerebellar white matter, arranged in the typical folia pattern of the cerebellar vermis. Its anatomy is critical for neurosurgeons, neuroradiologists, and neurologists, especially in posterior fossa surgery, tumor assessment, and congenital malformations.

Function

  • Contributes to trunk coordination and postural stability

  • Integrates vestibular and proprioceptive input

  • Supports smooth, coordinated limb movements

  • Participates in cognitive and motor planning through cerebellar connections

Synonyms

  • Lobule VI of vermis

  • Vermis VI

  • Superior posterior vermal lobule

MRI Appearance

T1-weighted images:

  • Declive appears as isointense gray matter relative to cortex, with interfolial white matter slightly hyperintense

  • Folia and fissures are delineated by signal contrast between gray and white matter

  • Pathological changes like tumor, infarct, or demyelination appear as focal hypo- or hyperintensity depending on the lesion

T2-weighted images:

  • Gray matter of the Declive is intermediate signal, while the white matter is hyperintense relative to gray matter

  • Excellent for identifying edema, infarction, or demyelinating lesions

  • Fissures appear as hypointense lines separating folia

STIR (Short Tau Inversion Recovery):

  • Normal Declive gray matter is intermediate to low signal

  • Pathological edema, inflammation, or tumors appear hyperintense, highlighting abnormal tissue in the vermis

T1 Post-Contrast (Gadolinium-enhanced):

  • Normal Declive shows minimal enhancement

  • Pathological lesions such as tumors, abscesses, or vascular malformations may demonstrate focal or diffuse enhancement, highlighting abnormal tissue or vascularity

CT Appearance:

  • Declive appears as isodense gray matter within the posterior fossa

  • White matter is slightly hypodense relative to gray matter

  • Folia and fissures may be visible indirectly via subtle density differences

  • CT is useful for detecting calcifications, hemorrhage, or mass effect in posterior fossa lesions

MRI images

Declive (VI) of Cerebellum mri sag image -img-00000-00000