Fig. 4. S Sensorium. C. Chiasma. a An arrow, d d Parallel rays of light falling upon the retinae ii. o o Oblique rays falling upon the retinas, r r Straight filaments of the optic nerve, p p De- cussating filaments. Fig. 6. Brain of a Fish, (the Hake.) … a a Optic nerves, b Oblique crossing of optic nerves, c Optic lobe of left side, being the chief source of the right optic nerve. Fig. 7. Brain of a Common Fowl. a a Optic nerves, c The chiasma dissected so as to shew its decussating la- mina?, i i Tractus optici.
Medicine
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