Xiv LIST OF ILLUSTRATIONS 



FIOURE PAGE 



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 transect ion of the sciatic nerve of a dog . . 134 

 147. A group of large meclullated 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 . . . 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 



