LATERAL DISSECTIONS OF THE VISCERA 



141 



off ventralwards, exposing the myelencephalon and cervical portion of the cord. As the 

 mesenchyma is pulled away, the ganglia and roots of the cerebral nerves will be exposed. 

 The mesenchyma between the ganglia and along the nerves may be removed with the end 

 of a small blunt needle. Care must be exercised in working over theSnesencephalon and 



Semilunar ganglion n. 5 Ophthalmic ramus n. 5 

 Gang, geniculi n. \ / Cerebrum 



Mesencephalon 

 Cerebellum 



Gang, acusticum n. 8 

 Gang, superius n. 9 



Gang, jugulare n. 10 



Gang. Froriep 



Auricular r. n. 10 



Gang. n. cen. i 



Gang petrosum n. 



N. accessorius 



N. hypoglossus 



Gang. cen. 5-8 



Gang. thor. I 



. Lung 



Diaphragm 



Dorsal lobe of liver 

 Mesonephro. 



Hypophysis 



N. opticus 



Lobus olfactorius 



Maxillary ramus n. 5 



'Mand. ramus n. $ 

 Chorda tympani n. 7 



. facial is 



Gang, nodosum n. 10 



Metanephros 



Lumbar gang. 



/ 

 Nerve to lower limb 



Sciatic nerve 



Nerve to lower limb 



FIG. 145. Lateral dissection of a 35 mm. pig embryo, to show the nervous system and viscera 



from the right side. X 4. 



telencephalon of the brain not to injure the brain wall, which may be brittle. By starting 

 with a clean dissection dorsally and gradually working ventrad, the more important organs 

 may be laid bare without injury. The beginner should compare his specimen with the 

 dissections figured and also previously study the reconstructions of Thyng (1911) and Lewis 

 (1903). 



