LATERAL DISSECTIONS OF THE VISCERA 



139 



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 be- 

 tween the ganglia and along the nerves may be removed with the end of a small blunt needle. 

 Care must be exercised in working over the mesencephalon and telencephalon of the brain not 



Semilunar ganglion n. 5 Ophthalmic ramus n. 5 



Gciiiciildlc gang, II. 7 



ilescnccphalon 

 \ 

 Cerebellum 



Gang. II. S 



Gang. sup. II. Q 



'Gang, jiigularc 11. in 



Gang. Froriep 



Auricular r. n. 10 



Cerebrum 



Hypophysis 



X . opiinis 



Lobus olfactorius 



g. n. eerv. i 

 Gang, petros. n. g 

 N. accessorius 



N. kypoglossits 



Gang. cerv. j-S 



Gang. Ihor. I 



Diaphragm' 



Dorsal lobe of live 

 Mesoneph 

 Mela 



■}[axillary ramus n. 5 

 Mand. ramus n. 5 

 i^^:^ Chorda, tymp. n. 7 



N. facialis (7) 

 Gang, nodosum n. 10 



Lung ^g, 



Nerve to lower 



R. atrium 

 R. ventricle 



Ventral lobe of liver 

 Umbil. cord 

 Lower limb 



atic nerve 



Fig. 145. — ^Lateral dissection of a 35 mm pig embryo to show the nervous system and viscera from the 



right side. X 4. 



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), 



