xiv LIST OF ILLUSTRATIONS 



142. Intracellular network (trophospongium) within a Purkinje cell of 



the cerebellum of Strix flammea . . . . . .128 



143. Golgi cell, type I 129 



144. Golgi nerve cell, type II .130 



145. Isolated nerve fibers from a frog 133 



146. A small portion of a transection of the sciatic nerve of a dog . . 134 

 147. A group of large medullated fibers from a nerve in the peritracheal 



areolar tissue of the cat ....... 134 



148. Nerve fibers 135 



149. Cross and longitudinal sections of the same funiculus of non- 

 medullated nerve fibers (turned up at the left), showing the 

 perineurium and the relationship of the neurolemma nuclei to the 

 axis cylinder bundles of neurofibrils ..... 136 



150. Cross-section of the trunk of the human vagus nerve, some distance 

 below the nodose ganglion, showing medullated and non-medul- 



lated fibers . . 137 



151. Successive stages in the degeneration process exhibited by the distal 

 stump of a medullated axon (from sciatic nerve of adult dog) fol- 

 lowing section . . . . . . . . 138 



152. Regenerative stages in the proximal stump of the cut sciatic nerve 



of the dog, several millimeters above the level of section . .139 

 153. Transection of the spinal cord of an embryo chick . . . 140 

 154. Transection of the spinal cord of a child, fifth lumbar segment . 141 

 155. Portion of gray substance from the anterior horn of the spinal cord 

 of man, showing nerve cell bodies, dendrons, medullated and non- 

 medullated portions of axons, and neuroglia .... 142 



156. Transverse section through the white substance of the human spinal 



cord 142 



157. Neuroglia from the spinal cord of a fetal pig .... 143 

 158. A long-rayed astrocyte ........ 144 



159. A short-rayed astrocyte, or mossy cell 144 



160. Neuroglia cell with adjacent fibers, from the pineal body of a yearling 



sheep 145 



161. Neuroglia cells and fibers from the spinal cord of an elephant . 146 

 162. Transection of the sciatic nerve of a dog . . . . .147 



163. Diagram of the origin and relations of the peripheral motor and 



sensory neurons ......... 148 



164. Bipolar cell from a spinal ganglion of a fish .... 149 



165. Transformation of bipolar cells into unipolar cells in the Gasserian 



ganglion of the pig ........ 149 



166. Section through the dorsal root ganglion of the first thoracic nerve 



of a cat . ......... 150 



167. A nerve cell from a section of a human Gasserian ganglion . .150 



