442 



INDEX 



Neurapophyses, 49 

 Neurenteric canal, 12 

 Neuroblasts, 145 

 Neuroglia, 25, 145 

 Neuromasts, 181, 195 

 Neuromeres, 161 

 Neurons, 23 

 Neuropore, 12 

 Nerve cells, 23 



centres, 152 



components, 181 



-end apparatus, 193 



hillocks, 195 



plexus, I7S 



roots, 173 

 Nerves, collector, 176 



cranial, 179 



motor, 174 



sensory, 174 



spinal, 174 



visceral, 175 

 Nervous system, 142 

 central, 143 

 development, 12 

 envelopes of, 162 

 peripheral, 173 

 sympathetic, 177 



tissue, 23 

 Newts, 6 



Nictitating membrane, 21 J 

 Nidamental organ, 358 

 Nipples, 41 

 Nodose ganglion, 191 

 Non-deciduata, 384 

 Non-elastic tissue, 26 

 Nose, 204 

 Notochord, 13, 51 

 Notochordal sheath, 51 

 Nuchal flexure, 151 

 Nucleus dentatus, 153 



Oblique muscles, 133, 135 

 Obturator foramen, 118 

 Occipital bone, 76 



lobe, 159 



muscle, 139 



nerves, 192 



vertebrae, 69 

 Occipitalia, 74 

 Oculomotor nerve, 184 



Odontoblasts, 28, 43, 224 

 Odontoid process, 56 

 (Esophageo-cutaneous duct, 255 

 (Esophagus, 238 

 Olecranon process, 129 

 Olfactory bulb, 171, 183 



duct, 208 



lobe, 148 



nerve, 182 



organs, 204 



sac, 205 



tract, 160, 171, 183 

 Omasus, 242 

 Omenta, 17 

 Omosternum, 65 

 Omphalo-mesenteric artery. 291 



vein, 291, 294, 307 

 Ontogeny, i 

 Opercular apparatus, 256 



gill, 259 

 Operculare, 85 

 Operculum, 85, 256 

 Ophthalmic nerve, 186 

 Opisthoccelous, 50 

 Opisthotic, 75 

 Optic cup, 213 



lobes, 149 



nerve, 184 



pedicel, 218 



recess, 148 



stalk, 213 



vesicle, 213 

 Oral cavity, 223 



glands, 23s 



hood, 223 



plate, 220 

 Orbicularis muscles, 139 

 Orbital glands, 237 

 Orbitosphenoid, 74 

 Organ of Corti, 201 



of Jacobson, 205, 212 

 Origin of muscles, 134 

 Oronasal groove, 207 

 Os basale, 92 

 Os cloacae, 120 

 Os en ceinture, 94 

 Os entoglossum, 106, 233 

 Os pubis, 118 

 Os transversum, 95 

 Os uncinatum, 106 

 Os uteri, 37S 

 Ossa suprastemalia, 66 



