Henry Gray (18251861). Anatomy of the Human Body. 1918.
The superior cerebellar peduncles (brachia conjunctiva), two in number, emerge from the upper and medial part of the white substance of the hemispheres and are placed under cover of the upper part of the cerebellum. They are joined to each other across the middle line by the anterior medullary velum, and can be followed upward as far as the inferior colliculi, under which they disappear. Below, they form the upper lateral boundaries of the fourth ventricle, but as they ascend they converge on the dorsal aspect of the ventricle and thus assist in roofing it in.
FIG. 704 Sagittal section of the cerebellum, near the junction of the vermis with the hemisphere. (Schäfer.) (See enlarged image)
FIG. 705 Dissection showing the projection fibers of the cerebellum. (After E. B. Jamieson.) (See enlarged image)
The fibers of the superior peduncle are mainly derived from the cells of the