Plate VII. — Fourth Dissection of the Frog. {Ad nat.) 



Thyroid, 



Brachial fSP^"''^^^ 



Plexus I Spinal 3. 

 Coeliac. 



Spinal 4. 



Spinal ; 

 Spinal 6. 



I" Spinal 7. 

 Sciatic! 

 Plexus I Spinal 8. _ 



V Spinal 9. 



Hypoglossal. 



Glosso-pharyngeal. 

 Lingual. 



Carotid Gland. 



Cutaneous. 



Sympathetic. 



Dorsal Aorta. 



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 oesophagus. 



