Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . oncussion of the eye; (4) irritation ofthe fifth cranial nerve, as in severe neuralgia; (5) certain brain diseases. THE SPECIAL SENSES. 209 Tlic3 latter are of special interest in this connection. Several diagramsincorporated in this work may prove of aid in explaining certain ana-tomical points that bear directly upon the snbject. The following diagram (Fig. 69) shows that the optic nerve fibreseventually pass to those region
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . oncussion of the eye; (4) irritation ofthe fifth cranial nerve, as in severe neuralgia; (5) certain brain diseases. THE SPECIAL SENSES. 209 Tlic3 latter are of special interest in this connection. Several diagramsincorporated in this work may prove of aid in explaining certain ana-tomical points that bear directly upon the snbject. The following diagram (Fig. 69) shows that the optic nerve fibreseventually pass to those regions of the gra^ matter on the surface of thebrain (the cerebral cortex) that are associated with the intelligent percep-tion of the images focused upon the retina. But it will be also observed thatthe optic nerve fibres {o and h) first pass through certain collections ofgray matter or centres within the optic thalami and the corpora quad-rigemina before they radiate to the so-called visual area of the eon-volutions. Let us now compare this diagram with another (Fig. 21), wliich willmake some of these statements more intelligible to the general reader. VISUAL AREA 0. BUEs If Fig. 69.—A Diagram Designed by the Author to Show the General Course ofFibres in the bENsoRv and Motor Tracts and their Relation to CertainFasciculi of the Optic Nerve Tracts. (Modified from Seguin.) S, Sensory tract inposterior region of mesocephalon, extending to O and T, occipital and temporal lobes ofhemispheres: M, motor tract in basis cruris, extending to P and F, parietal and (part of)frontal lobes of hemispheres; C Q, corpus quadrigeminum; O T, optic thalamus; N L,nucleus lenticularis ; N C, nucleus caudatus; 1, the fibres forming the tegmentum cruris(Meynert); 2, the fibres forming the basis cruris (Meynert); a, fibres of the optic nervewhich become associated with the optic centre in the optic thalamus, and are subsequentlyprolonged to the visual area of the convolutions of the cerebrum ; fi, optic
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