. A treatise on nervous diseases : their symptoms and treatment : a text-book for students and practitioners. Fig. 8.—Diagram illustrating decussation of optic nerves in the chiasma, andthe effect of lesions of portions of the optic , optic nerves; ot, optic tracts; eg, corpora geniculata; a, b, c, lesions infiont, at side of chiasma, and on optic tract. 26 DISEASES OF THE BRAIK The decussation of the optic nerves at the chiasmais only partial. The diagram on page 25 may give anidea of the arrangement of the fibers. The fibers fromthe right optic tract pass to the right side of both ret
. A treatise on nervous diseases : their symptoms and treatment : a text-book for students and practitioners. Fig. 8.—Diagram illustrating decussation of optic nerves in the chiasma, andthe effect of lesions of portions of the optic , optic nerves; ot, optic tracts; eg, corpora geniculata; a, b, c, lesions infiont, at side of chiasma, and on optic tract. 26 DISEASES OF THE BRAIK The decussation of the optic nerves at the chiasmais only partial. The diagram on page 25 may give anidea of the arrangement of the fibers. The fibers fromthe right optic tract pass to the right side of both reti-nas, the larger portion decussating with those of theopposite side ; and mce mrsa for those of the left Fig. 9.—This is modified from Huguenin, to agree with Wernickes descriptionof the origin of the fibers of the optic ^ anterior corpus quadrigeminum ; pu^ pulvinar; cpq, crus of posterior corpusquadrigeminum; cgi, internal corpus geniculatum; cge, external corpus genicu-latum; cr, posterior fibers of the corona radiata, passing to the occipital lobe; oe,external division of the optic tract, passing to the external corpus geniculatum, thepulvinar, and the anterior corpus quadrigeminum; oi, the inner division of theoptic tract, passing to the internal corpus geniculatum, and the posterior corpusquadrigeminum ; p, peduncular fibers ; p, the hemispherical bundle seen in trans-verse section of the crus cerebri; sn, substantia nigra; iii, third nerve; iii, itsnucleus ; scp, superior cerebellar peduncle (red nucleus) ; plh^ posterior longitu-dinal bundle ; as, aqueduct of Sylvius. ANATOMY. 27 When an attempt is made to study the optic tract,tracing its fibers to their central origin
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