320 



ANATOMY OF VERTEBRATES. 



branch passing to the myelon ; b, 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 



fl 



Communication between the sympathetic and third spinal nerve in the Frog. ccxn. 



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

 mark the ganglions in the Frog. 



58. Sympathetic of Fishes.- - This system, as being an off- 

 shoot or subordinate element 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 vagi. In Osseous 

 Fishes the visceral plexuses are continued into or connected with 

 slender nerves, accompanying the aorta along the haemal 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 the fifth, and a filament is sent forward 

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

 nerve, to which Cuvier thought he had also traced a filament of 



o 



the sympathetic in the Cod ; the sympathetic next communicates 

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

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

 tition of the gills ; the sympathetic trunks also receive accessions 

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



