. Handbook of zoology with examples from Canadian species, recent and fossil [microform]. Zoology; Invertebrates; Zoologie; Invertébrés. u FUNCTIONS OF TIIIC ANIMAL. nerve fibres take their origin in part from each. The mammals, birds, reptiles and fishes have their nervous system constructed on this type (I'igs. 8 k 9.). Fig. l)ia;,n!iin of Hmin of IJird, (Myeliiioi'iilialmis)- (a) Olfactory Lol.'os ; (h) Ci'irhiiil Heiiiis))li('res ; (<•) Optir L(il«'is ; ((/) Ccrtbullum ; (e) Medulla Oblongata; (/) Aiuiltory iic-rves ; (y) Sjtiiial ("ord. Iiaj,'ratii of tiervous system of a worm
. Handbook of zoology with examples from Canadian species, recent and fossil [microform]. Zoology; Invertebrates; Zoologie; Invertébrés. u FUNCTIONS OF TIIIC ANIMAL. nerve fibres take their origin in part from each. The mammals, birds, reptiles and fishes have their nervous system constructed on this type (I'igs. 8 k 9.). Fig. l)ia;,n!iin of Hmin of IJird, (Myeliiioi'iilialmis)- (a) Olfactory Lol.'os ; (h) Ci'irhiiil Heiiiis))li('res ; (<•) Optir L(il«'is ; ((/) Ccrtbullum ; (e) Medulla Oblongata; (/) Aiuiltory iic-rves ; (y) Sjtiiial ("ord. Iiaj,'ratii of tiervous system of a worm (IIonioyan{,'liatc); (a) a''soj)ha;,'eal rint,'; {h) Double abdominal cord witb uaii^'iu. Fitf. 11.—I>ia};ram of nervous system of a Mollusk (Hetero>,'aii) Pedal ganglia ; (f) Visceral >;anj;lii>n. Fiy. 12.—Diayrani of nerve of a Star-fish ; (a) <Ksoi)hageal ring. 2. A uerve-rifig around the gullet and abdo7ni?ial nerve cord with ganglia.—(Homogangliate) In this type the principal nerve-centre consists of a ring surrounding the gullet or oesophagus, with a mass above (prae- cesophageal mass) giving off nerves of sensation, and a mass below (post-a3sophageal mass) giving off a double abdominal cord, having ganglia or subordinate masses of nerve-matter at intervals. This is the nervous system of spiders, insects, Crustacea and worms.—(Fig. 10.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dawson, J. W. (John William), Sir, 1820-1899. Montreal : Dawson
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Keywords: ., bookcentury1800, bookdecade1880, booksubjecti, booksubjectzoology
