AMPHIBIA. 57 



PLATE XT. 



THE SYMPATHETIC NEKYE OF THE TUKTLE. 



i * v r i r 5 o 



(TESTUDO IMBRICATA.) 



A .0 



IN this subject, the -sympathetic nerve of each side formed a distinct -trunk, but 

 communicated with that of the par vagum by branches. From its- upper' part, one 

 branch passed forward along with one of the divisions of the carotid artery, in a canal 

 at the base of the skull, gave a filament to the har(J portion of the seventh, and 



- f,*. *'r-, - f.r.A^.-^ r T 



communicated with a branch of the second trunk of the' fifth, which terminated on the 

 posterior part of the palate.. Another branch passed, with the other division of the 

 carotid artery, into the reticular sinus, close to the external auditory meatus, and 

 communicated with the ninth, the par vagum, the glosso-pharyngeal, and the hard 

 portion of the seventh. 



The trunk of the sympathetic nerve in this subject is very similar to that of the 

 par vagum, except that it has a somewhat more red and close appearance at its 

 superior part, and near the first thoracic ganglion. The branches belonging to the 

 sympathetic, and those belonging to the par vagum, could be more clearly determined 

 than in the Testudo Mydas, which has both these nerves generally coalescing. 



a. Right auricle ; b. Veins returning blood to the right auricle ; c. Left auricle ; 

 d. Left pulmonary vein, the right has been removed ; e. Pulmonary artery ; 

 / Right aorta ; g. Left aorta ; h. Division of the carotid arteries ; . Division 



i 



