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Neuroanatomy 7. Cerebellum

7.3 Cerebellar Pedundes and Tracts

Neuroanatomy 7. Cerebellum

Superior cerebellar pedunde

Inferior cerebellar pedunde

Anterior spino-cerebellartract

Middle cerebellar pedunde

Trigeminal nerve

Vestibulocochlear

nerve

Facial nerve

Central tegmental tract

Olive

A Cerebellar pedundes a Left lateral view with the upper portion of the cerebellum and lateral portions of the pons removed. This dissection, which has been prepared to show fiber structure, clearly shows the course of the cerebellar tracts. The size of the cerebellar pedundes, and thus the mass of entering and emerg-ing axons, is substantial and reflects the ex-tensive neural connections in the cerebellum (see p. 241). The cerebellum requires these numerous connections because it is an integrating center for the coordination offine movements. In particular, it contains and processes vestibular and propriocep-tive afferents and it modulates motor nuclei in other brain regions and in the spinał cord. The principal afferent and efferent connections of the cerebellum are reviewed in B. b Left lateral view. Here the cerebellum has been sharply detached from its pedundes to demonstrate the complementary cut surface of the pedundes on the brainstem (compare with Ac, p. 238).

Vestibulocochlear nerve

Facial nerve

Nervus intermedius

Trigeminal nerve

Trochlear nerve

Superior cerebefar pedunde

Middle cereoefca-pedunde

Inferior cereoafar pedunde

Glossopharyngeal

nerve