Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 SENSE OEGANS. 83 blood vessels and viscera, which there form a complicated network of nervous fibres containing here and there ganglion cells. The nervous sys- tem possesses further peripheral apparatus, the sense organs, the function of which is to bring about the perception of certain conditions of the outer world as im- pressions of a definite mode of sensation (specific energy of nerves* Joh. Miiller). These peripheral organs usually have the form of peculiarly arranged aggrega- tion
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 SENSE OEGANS. 83 blood vessels and viscera, which there form a complicated network of nervous fibres containing here and there ganglion cells. The nervous sys- tem possesses further peripheral apparatus, the sense organs, the function of which is to bring about the perception of certain conditions of the outer world as im- pressions of a definite mode of sensation (specific energy of nerves* Joh. Miiller). These peripheral organs usually have the form of peculiarly arranged aggrega- tions of hair-shaped or rod-shaped nerve terminations (hair- cells, rod-cells of sen- sory epithelium) con- nected by fibrilhie with ganglion cells, through which under the action of external influences a move- ment of the nervous substance is set up, which travels to the central organ and there affects con- : In opposition to the differences in the quali- ties of the sensations produced by each indi- vidual sense organ (colour, tone). FIG. 80.—Nervous system of the frog (after Ecker). Ol olfactory nerves ; O, eye ; Op, optic nerve ; Vy, Gasseriau ganglion ; Xg, ganglion of vagus ; Spn 1, first spinal nerve ; Sr, brachial nerve ; Sql-W, the ten ganglia of the sym- pathetic system. Ji, ischial nerve.
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