Which cerebellar peduncle is the largest, connects the pons to the cerebellum, and consists almost entirely of fibres arising from the contralateral pontine nuclei?
- A Superior cerebellar peduncle
- B Middle cerebellar peduncle ✓
- C Inferior cerebellar peduncle
- D Juxtarestiform body
Correct answer: B. Middle cerebellar peduncle
Explanation
The middle cerebellar peduncle is the largest of the three peduncles and carries the transverse pontocerebellar fibres, which originate from pontine nuclei after corticopontine fibres synapse there, cross the midline, and enter the cerebellum as mossy fibres. This forms the massive cortico-ponto-cerebellar pathway. The superior peduncle is mainly efferent (dentatorubrothalamic), the inferior peduncle carries spinocerebellar and vestibulocerebellar inputs, and the juxtarestiform body is a small vestibular subdivision of the inferior peduncle.
Reference: Gray's Anatomy: The Anatomical Basis of Clinical Practice, 42nd ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.