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103 



PLATE VIII 



Pinna Reflex and Conduction in the Spinal Roots (Exerc. XVI). 



Figs. 1, 2, and 3. Exposure of 2nd spinal ganglion and of 2nd cervical nerve (obs. 

 76 a). 



Fig. 1. 1st stage, p, skin-flap ; b, wooden block supporting neck. 



Fig. 2. 2nd stage. Ganglia and spinal theca exposed, f, skin-flap. 



Fig. 3. Dissection of 2nd cervical nerve of left side, left lateral aspect, showing the deep 

 branch which contains afferent fibres from pinna via n. auric, magnus. 



Fig. 4. 3rd stage. Spinal theca opened ; dorsal and ventral roots of ganglion separated 

 for severance of either, f, skin-flap ; d, hook raising dorsal root of ganglion outside spinal theca ; 

 V, hook passed under ventral root of ganglion inside the opened spinal theca. 



Figs. 5 and 6. Exposure of great auricular nerve (obs. 76 b). 

 Fig. 5. 1st stage, f, skin-flap. 

 Fig. 6. 2nd stage, f, skin-flap. 



