PISCES. 
—— 
Diagram of the encephalon of the Perch, showing the general distribution of the cerebral nerves. 
8, 8, vestibule of the ear ; other letters as in figs. 526, 527, and 528. (After Cuvier.) 
beneath the throat in front of the pectorals, they 
are supplied from the same pairs of nerves; 
bat in the abdominal division, where the 
ventrals are situated towards the hinder part of 
the body, they receive their supply from spinal 
nerves placed proportionally further back. 
997 
‘qf thi; 
be fer- 
Sympathetic system—The sympathetic sys- 
tem of nerves is in Fishes extremely small, so 
much so, indeed, that its existence has been 
denied by some anatomists; it is, however, in- 
variably present, although its filaments are of 
great tenuity. It runs along the sides of the 
Fig. 531. 
i \ } 
e 
\ 
Lateral and spinal nerves of the Cod ( Gadus morrhua). ( After Swan. ) 
1,1, 1, dorsal communicating branch, derived from the fifth pair and nervus vagus, which joins all the 
nerves of the dorsal fins 10; 2 and 3, two branches from the trank of the par vagum passing down along 
the side underneath the skin; 4, branch running beneath the skin, which communicates with the inferior 
branches of the spinal nerves ; 8, 9, exit of the nerves from the spinal canal. 
spine, as in the higher Vertebrata, receiving 
branches from each of the spinal nerves, and 
anteriorly it communicates with a branch of the 
fifth, and also with the nervus vagus. On the 
left side, after having sent a filament to join the 
trunk of the par vagum on the stomach,* it 
* Swan, Comp. Anat. of Nerv. Syst. p. 24. 
