Plate VII.—FourTH DIssEcTION OF THE FROG. (Ad nat.) 
Hypoglossal. 
\~ Glosso-pharyngeal. 
BA Lingual. 
i\ Carotid Gland. 
Brachial 
Spinal 2." e ‘ ae Cutaneous. 
Plexus 
Spinal 3. 
Ceeliac. 
c Sympathetic. 
Spinal 4. 
Spinal 5 ~ | 
‘Dorsal Aorta, 
Spinal 6.- 4 
ss \ 
“Spinal 7. 
Sciatic at 
Plexus} Spinal 8.-~ a 
Spinal 9. 
Spinal 10. x P 
Showing IXth and Xth cranial nerves, the spinal nerves, sympathetic nerves, 
and arterial system. After the third dissection, the kidneys, veins, and liver are 
carefully removed and the heart is reflected over to the right. The sympathetic and 
vagus are only shown on the left. The latter is unlabelled but is seen emerging from 
between the glossopharyngeal and the hypoglossal and passing to the heart and lung, 
another branch passing behind the lung down the cesophagus. 
