320 



ANATOMY OF VERTEBRATES. 



branch passing to the myelon ; h, a portion passing to the peri- 

 phery ; c, fibres of the communicating nerve passing in the 

 sympathetic towards the head ; d, similar fibres passing towards 



212 



Coimnuuicatiou ht'twofii tlic syinpafhetic and third spiual none in the Frog- ccxii. 



the pelvis ; g, g, are ganglion-cells ; /«, specks of pigment, which 

 mark the ganglions in the Frog. 



§ 58. Sipnpathetic of Fishes. — This system, as being an off- 

 shoot or subordinate clement of the general myelencephalous 

 series of nerve-organs, is differentiated by progressive steps. In 

 the Myxinoid Fishes it is represented by the intestinal branch 

 continued from the confluence of the two nervi ^'agi. In Osseous 

 Fishes the visceral plexuses are continued into or connected with 

 slender nerves, accompanying the aorta along the hremal canal, 

 and representing the trunks of the sympathetic in higher Verte- 

 brates. The first or anterior communication of this nerve, in the 

 Cod, is with a branch of tlio fifth, and a fllament is sent forward 

 to the ciliary ganglion : in the Carp a filament joins the abducent 

 nerve, to which Cuvicr thouglit he had also traced a filament of 

 tlie sympathetic in the Cod ; the sympathetic next communicates 

 with that anterior portion of the vagus (the glosso-pharyngeal) 

 which joins part tif the acoustic nerve, and supplies the first par- 

 tition of flic gills ; the sympathetic trunks also receive accessions 

 from the trunks of the vagus, and, converging, intercomnumicate 



