344 



INDEX AND GLOSSARY 



Pharynx, innervation of, 144, 147, 



243 



PniLippsoN, M., 133, 135, 142 

 Photoreceptors, nervous End-organs 



sensitive to light, 212 

 Phrenology, 280, 281, 285 

 Phylogeny of nervous system. See 



Nervous system, evolution of. 

 Physiognomy, 280 

 Pia mater, the inner brain membrane. 

 Pigment, retinal. See Retina, pig- 

 ment of. 



PIKE, F. H., 194 

 Pillar of CORTI, 197, 198 



of fornix. See Fornix column and 



Fornix cms. 

 Pilocarpin, 231 

 Pineal body. See Body, pineal. 



eye. See Parietal eye. 

 Pituitary body. See Hypophysis. 

 Plants contrasted with animals, 22 

 Plasticity in behavior. See Behavior, 



variable. 



Plate (lamina), a general term ap- 

 plied to any flat structure or 

 layer; specifically to the six 

 longitudinal bands or zones into 

 which the Neural tube is divided 

 as explained in the following 

 definitions, 117. 



dorsal (roof plate, Deckplatte), the 

 unpaired dorsal longitudinal 

 epithelial zone of the Neural 

 tube; it is non-nervous and in 

 some parts of the adult brain is 

 enlarged to form a Tela, 153. 

 dorso-lateral (alar plate, wing 

 plate, epencephalic region, Flii- 

 gelplatte), one of a pair of 

 dorso-lateral longitudinal zones 

 of the Neural tube; it gives rise 

 to the dorsal gray column of the 

 spinal cord and to the sensory 

 centers of the brain, 117, 120, 

 153 



floor. See Plate, ventral, 

 neural. See Neural plate, 

 roof. See Plate, dorsal, 

 ventral (floor plate, Bodenplatte), 

 the unpaired ventral longitu- 

 dinal zone of the Neural tube; 

 it is originally non-nervous, but 

 in the adult is invaded bv the 

 ventral Commissure, 153 



Plate, ventro-lateral (basal plate, 

 hypencephalic region, Boden- 

 platte), one of a pair of ventro- 

 lateral longitudinal zones of the 

 Neural tube; it gives rise to the 

 ventral gray column of the cord 

 and to the motor centers of the 

 brain, 117, 120, 153 

 Play, 257 



Pleasantness, Pleasure. See Affec- 

 tion. 



Pleura, 125, 250 



Plexus, chorioid (choroid plexus, 

 plexus chorioidcus), a thin 

 non-nervous portion of the 

 brain wall to which highly 

 vascular Pia mater is adherent 

 and which is crumpled and 

 thrust into the brain ven- 

 tricles. 



lateral, the chorioid plexuses of 

 the lateral ventricles of the 

 cerebral hemispheres, 222 

 of fourth ventricle (plexus cho- 

 rioideusventriculi quart i), the 

 chorioid plexus which forms 

 the roof of the fourth ven- 

 tricle, 119, 121, 152, 264 

 of third ventricle (plexus chori- 

 oideus ventriculi tertii), the 

 chorioid plexus which forms 

 the roof of the third ven- 

 tricle, 162, 166, 167 

 ganglionic, of sympathetic nervous 

 system, an entanglement of 

 sympathetic nerves and ganglion 

 cells; most of the nervous plex- 

 uses enumerated in the follow- 

 ing list are ganglionic plexuses 

 of this type, 225, 226, 241 

 nervous, an interlacing of differ- 

 ent kinds of nerve-fibers, 53 

 aortic, 226 

 of AfKHBACH (myenteric plexus), 



241 



brachial. 226 

 bronchial, 226,238 

 cardiac, 226, 235 

 celiac, 226 

 cervical, 226 

 coronary, 226 

 e<ophageal, 226 

 gastric, 226 

 hypogastrie., 226, 239 



