Superior cerebellar peduncle

The superior cerebellar peduncles (SCP) are paired white matter fiber tracts that connect the cerebellum with the midbrain. The superior cerebellar peduncle contains vital afferent and efferent fibers including cerebellothalamic, cerebellorubral and ventrospinocerebellar tracts.

The superior cerebellar peduncles decussate centrally (decussation of Wernekinck) in the ventral midbrain at the level of the inferior colliculi. Diffusion tensor imaging (DTI) enables depiction of the superior cerebellar peduncle decussation and on the color-coded fractional anisotropy map this is seen as a red dot in the ventral midbrain (conventionally, red denote transversely-oriented fibers).

The thin superior medullary velum is suspended between the two peduncles.

The superior cerebellar peduncles receive their arterial blood supply through branches of the superior cerebellar artery.

Clinically superior cerebellar peduncular decussation is relevant in congenital anomalies of the posterior fossa in particular in Joubert syndrome where the superior cerebellar peduncle decussation is absent, giving the characteristic molar tooth sign.

Anatomy: Brain
Share article

Article information

rID: 45542
Section: Anatomy
Tag: cases, refs
Synonyms or Alternate Spellings:
  • Superior cerebellar peduncle (SCP)
  • Superior cerebellar peduncles

Support Radiopaedia and see fewer ads

Cases and figures

  • Figure 1: decussation of SCP on DTI
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.