CORRELATED ANATOMICAL AND PHYSIOLOGICAL 

 STUDIES OF THE GROWTH OF THE NERV- 

 OUS SYSTEM OF AMPHIBIA 



II. THE AFFERENT SYSTEM OF THE HEAD OF AMBLYSTOMA 



G. E. COGHILL 



Department of Anatomy, University of Kansas 



SEVENTY-NINE FIGURES 



CONTEXTS 



I. The anatomical part 248 



1. The trigeminal nerve '-48 



a. The non-motile stage 248 



b. The early flexure stage 251 



c. The coiled-reaction stage 253 



d. The early swimming stage 255 



2. The facial and auditory nerves 257 



a. The non-motile stage 258 



b. The early flexure stage 259 



c. The coiled-reaction stage 201 



d. The early swimming stage 264 



3. The glossopharyngeal and vagus nerves 206 



a. The non-motile stage 206 



b. The early flexure stage 207 



c. The coiled-react ion stage 20S 



d. The early swimming stage 2/0 



4. The eye and optic nerve 273 



5. The olfactory organ and nerve 275 



6. Summary 276 



II. The physiologial part 280 



1. Response to tactile stimulation 280 



2. Response to chemical stimulation 285 



3. Response to light 285 



4. Response to olfactory stimulation 288 



5. The auditory and lateral line organs 288 



6. Summary 289 



III. Discussion 290 



1. Lateral line primordia, placodes and ectodermal thickenings 291 



2. The function of the auditory vesicle 292 



3. The sensory nerve roots in relation to later development 293 



4. The development of function in the neurone and in the reflex arc . . 296 



5. The cranial nerves of Amphibia 29/ 



6. Ncurobiotaxis -9^ 



247 



