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1 Interstitial nucleus of Cajal. Nucleus inter-stitialis [[Cajal]]. Group ofcells located lateral to the nucleus of the oculomotor nerve, from which it is separated by the medial longitudinal fasciculus. It contains fibers from the vestibular nuclei, globus pallidus and stratum griseum of the superior colliculus. B

2 Tegmental nuclei. Nuclei tegmenti (tegmen-tales). Nuclei in the reticular formation dorsal to the trochlear nucleus and ventral to the medial longitudinal fasciculus. C

3 Red nucleus. Nucleus ruber. Iron-rich nucleus between the substantia nigra and central gray matter with tributaries from the cerebral cortex and thalamus. It is inserted in the tract from the cerebellum to the spinal cord. B

4 Parvicellular part. Pars parvocellularis. Group of small cells forming the larger part of the red nucleus and part of the rubrospinal tract.

5 Magnocellular part. Pars magnocellularis. Group of large cells occupying the caudal part of the red nucleus; most of its fibers enter the rubrospinal tract.

6 Endopeduncular nucleus. Nucleus en-dopeduncularis. Cell group located medially in the cerebral crus directly after the site where it enters the base of the brain. It probably inserts in the tract between the globus pallidus and reticular formation.

7 Decussations of tegmentum. Decussationes tegmenti (tegmentales). Crossing of the ru-brospinal, rubroreticular and tectospinal tracts. B

8 Decussation of superior cerebellar peduncle.

Decussatio pedunculorum cerebellarium su-periorum. Crossing of the superior cerebellar peduncle below the inferior colliculus and anterior to the medial longitudinal fasciculus. C

9 Dentatorubral fibers. Fibrae dentatorubrales. Component of the superior cerebellar peduncle which passes into the red nucleus.

10 Rubrospinal tract. Tractus rubrospinalis [[Monakow]]. From its origin in front of the lateral pyramidal tract, this extrapyramidal tract passes from the red nucleus to the anterior horn cells.

11 Tectobulbar tract. Tractus tectobulbaris. It extends from the posterior tegmental decussa-tion to the opposite side, anterior to the medial longitudinal fasciculus and then passes to the pontine nuclei, especially to the nuclei of the ocular muscles.

12 Tectospinal tract. Tractus tectospinalis. Initially courses similar to the tectobulbar tract, then descends in the anterior funiculus of the spinal cord.

13 Lateral lemniscus. Lemniscus lateralis. Partly crossing portion of auditory tract passing to the inferior colliculus. C D

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