Dentate Nucleus: Connectivity-Based Anatomic Parcellation Based on Superior Cerebellar Peduncle Projections

Area of Science:

• Neurosurgery
• Neuroanatomy
• Cerebellar Nuclei

Background:

• The dentate nucleus (DN) has significant surgical importance due to its complex efferent connections.
• Understanding the dentatorubrothalamic (DRT) tract is vital for interpreting network-associated symptoms and surgical complications.

Purpose of the Study:

• To elucidate the microsurgical anatomy of the dentate nucleus (DN).
• To map the efferent connections of the DN, specifically the dentatorubrothalamic (DRT) tract.
• To provide insights into surgical network-associated symptoms and complications.

Main Methods:

• Fiber dissections of the cerebellum, DN, and superior cerebellar peduncle (SCP).
• Examination from anterior, posterior, and lateral approaches.
• Analysis of DN connections and relationships with adjacent neural structures.

Main Results:

• The DN was divided into four compartments: lateral major, lateral anterosuperior, posteromedial, and anteromedial.
• Fibers from lateral compartments predominantly decussated via the SCP.
• Fibers from the posteromedial compartment ascended ipsilaterally and decussated; anteromedial fibers ascended ipsilaterally without decussation.

Conclusions:

• Clarifying the anatomofunctional organization of the DN relative to the SCP enhances microneurosurgical outcomes.
• Proposed compartmentalization of the DN aids in reducing surgical complications.
• Improved understanding benefits infratentorial surgery involving the DN.