270 



INDEX 



Notochord, traces of, in adult, 49 



head end of, relations of anterior primitive 

 segments to, 50 



formation of vertebrae round, 250, 251 



disappearance of, in vertebrae, 250 



connection with bucco-pharyngeal mem- i 

 brane, 254 



connection with cranium, 254 

 Notochordal canal, formation of, 39 



sheath, development of, 250 



plate, 37 



canal, opening of, as representing blasto- 



pore, 45 



Nuck, canal of, 201 

 Nuclei of origin of cerebral nerves, 127 

 Nucleolus, true, of animal cell, 4 

 Nucleus, structure of, 1, 2, 3 



pulposus, 251 



OBEX, 108 



Occipital segment of basi-cranial plate, 256 



Occipito-spinal nerves, 127, 130 



<Esophagus, 160 



Olfactory pit, 83, 151 



bulb and tract, origin of, 118 



nerve, 155 



capsule, 255 

 Omenta, 236, 244, 246 

 Oocyte, structure of, 7 



maturation of, 10 



development of, in germinal epithelium, 



191 

 Oogenesis, 7, 10 



synapsis in, 22 

 Oogonia, 10 



Opercula of island of Reil, 124 

 Opossum, blastoporic aperture in, Selenka, 43 

 Optic chiasma or commissure, 113, 141 



cup, development of, 137, 140 



disc, 141 



recess, 113 



foramen, 256 



stalk, formation of, 106 



stalk, appearance of nerve-fibres in, 141 



tract, 141 



vesicles, 82, 106, 136 

 Ora serrata, 140 

 Organ of Corti, 148 

 Organs of the body, classification of, according ' 



to origin, 93 

 Os articulare, 260 

 Os dentale, 257 



Ossicles, auditory, formation of, 257 

 Ostium primum, Born, 212 

 Ostium secundum, 212 

 Otis on cloacal region, 201, 202 

 Ovary, development of, 189 



imbedding of blastocyst in stroma of, 73 



change of position of, 196 

 Ovum, alecithal, 9 



germinal vesicle of, 9 



holoblastic, 25, 27 



attachment of, to uterus, 65 



site of implantation of human, 65 



human, villi in, 75 



imbedding of, 65, 66, 67 



fertilisation of, 14 



maturation of, 10 



meroblastic, 27 



segmentation of, 25 



Ovum, zona pellucida of, 7 

 zona radiata of, 8 

 mammalian, phylogeny of, 27 

 development of primitive, 190 



Oxychromatin, 3 



PAL^OCBANIUM, 249 

 Palatal folds, 154 

 Palate, primitive, 154 



permanent, formation of, 155 

 Pallium, 116 

 Pancreas, development of, 175 



ducts of, 176 

 Papilla, genital, 201 

 Papillae of tongue, 160 

 Papillary muscles, 215 

 Parachordal cartilages, absence of, in human 



embryo, 254 



Paradidymis, or organ of Giraldes, 192 

 Paraflocculus, 110 

 Paraplasm, 2 



Parathymus. See Parathyroid. 

 Parathyroid bodies, 172 

 Parker, on stapes, 260 

 Paroophoron, 193 

 Parovarium, 192 

 Pars intermedia, of facial nerve, 132 



membranacea septi, 217 

 Paterson, on origin of sympathetic system, 133 



limb-muscles, 247 



development of sternum, 253 

 Peduncles, superior cerebellar, 110 



of cerebrum, 111 



Pelvis of kidney, primitive, 182, 183 

 Penis, glans, 203 



Perforated spot, anterior, 118, 120 

 Perforatorium of spermatozoon, 5 

 Pericardium, 52, 206, 237 

 Perilymph, development of, in inner ear, 148 

 Perineum, 201, 202 

 Peritoneum, 242, 244 

 Peters, on early human ovum, 27 



on placenta, 74 



ovum of, mesoderm in, 35 



imbedding of, in uterine mucous mem- 

 brane, 65 



placental plasmodium in, 73 

 description of, 80 

 Petromyzon, segmentation of mesoderm in, 50 



head-segmentation in, 249 



origin of segmental ganglia in, 129 

 Pfliiger, egg- tubes of, 190 

 Phagocytic action of trophoblast-cells, 74 

 Phaochrome or chromaffin bodies, 135 

 Phaochromoblast, 136 

 Pharynx, development of, 53, 158 

 Philtrum, 151 

 Pia mater, 105, 116, 250 

 Pig, muscle-plate in, 56 



closure of neural tube in, 105 



development of tongue in, 159 



development of optic vesicle in, 136 



number of neuromeres in, 129 



duct of Gartner in, 193 



origin of lymphatics in, 236 



masticatory muscles in, 248 



epithelium of genital ridge in, 188 

 Pineal body, 111, 113, 114 

 Pituitary body, cerebral lobe of, 111, 115 



glandular portion of, 115/156 



