Which statement about the middle cerebellar peduncle is correct?
- A It is the smallest peduncle and carries fastigial efferent fibres
- B It carries the ascending anterior spinocerebellar tract into the cerebellum
- C It is the largest peduncle and consists almost entirely of pontocerebellar fibres ✓
- D It connects the cerebellum to the vestibular nuclei exclusively
Correct answer: C. It is the largest peduncle and consists almost entirely of pontocerebellar fibres
Explanation
The middle cerebellar peduncle is the largest of the three and is composed almost entirely of transverse pontine fibres that relay corticopontocerebellar input from the contralateral cerebral cortex. Fastigial efferents and vestibulocerebellar fibres travel in the inferior peduncle, while the anterior spinocerebellar tract enters through the superior cerebellar peduncle by looping over its upper border. No exclusive vestibular connection defines any single peduncle.
Reference: Gray's Anatomy, 42nd ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.