A manual of anatomy . perior. The inferior peduncles, or restifonn bodies, enter thecerebellum beneath the other two. Each consists of afferent andefferent fibers; the afferent fibers comprise: (i) the dorsolateralsuperficial spinocerebellar tract (direct cerebellar) derived from thecolumn of Clark (nucleus thoracis) of the spinal cord and ending THE INTERNAL ANATOMY OF THE CEREBELLUM 409 in the gray of the vermis of both (but chieily the opposite) sides; (2)the olivocerebellar fibers (internal arcuate of oblongata) that arisein the olivary nucleus and end in the cortex of the vermis and hemi-
A manual of anatomy . perior. The inferior peduncles, or restifonn bodies, enter thecerebellum beneath the other two. Each consists of afferent andefferent fibers; the afferent fibers comprise: (i) the dorsolateralsuperficial spinocerebellar tract (direct cerebellar) derived from thecolumn of Clark (nucleus thoracis) of the spinal cord and ending THE INTERNAL ANATOMY OF THE CEREBELLUM 409 in the gray of the vermis of both (but chieily the opposite) sides; (2)the olivocerebellar fibers (internal arcuate of oblongata) that arisein the olivary nucleus and end in the cortex of the vermis and hemi-spheres and also in the dentate nucleus; (3) the external arcuatefibers from the nuclei gracilis and cuneatus of both sides; (4) fibersfrom the vestibular and trigeminal nuclei; (5) cerebellospinal fibersarising in the cerebellum and ending in the ventral horns of thespinal cord (efferent). The middle peduncle {brachium pontis) the largest consists offibers running in opposite directions across the midline and consti-. FlG. 295.—Section of the right cerebellar hemisphere showing the dentate nucleus. (From a photograph.) tuting a commissure connecting the two lateral cerebellar hemisphereswith each other. Most of these fibers end in the nuclei pontis ofthe same or opposite side and new fibers from these cells completethe circuit. In addition, some of the fibers connect the cerebellarhemispheres with certain cerebral nerve nuclei, especially the oculo-motor, trochlear and abducens nuclei. The superior peduncles {hrachia conjunctiva) the smallest, forman oval or concavoconvex band; the fibers arise in the dentatenucleus of the same side, chiefly, with additional fibers from thenuclei fastigii of both sides. The fibers decussate in the midbrainwhere most of them end in the red nucleus, while a few continue tothe thalamus. This peduncle also contains the ventrolateral super-ficial spinocerebellar tract (Gowers). Its fibers instead of enteringthe cerebellum through the inferior ped
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
