Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 BE>-SE OEQAKS. 83 blood vessels and visCvT. 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 pei-ipheral organs usually have the form of peculiarly arran
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 BE>-SE OEQAKS. 83 blood vessels and visCvT. 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 pei-ipheral organs usually have the form of peculiarly arranged aggrega- tions of hair-shaped or rod-shaped nerve tenninations (hair- cells, rod-cells of sen- sory epithelium) con- nected by fibi'illfe 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 a ff e ct s con - which there form a complicated netwoj k * 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). 01 olfactory nerves ; O, eye ; O/), optic nerve ; T'</, ganglion ; Xg, ganglion of vagus ; Spn 1, first spinal nerve ; Br, brachial nerve ; -S^l-lO, the ten ganglia of the sym- pathetic system. Js, ischial nerve.
Size: 922px × 2169px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
