468 
Lenticular zone of optie cup, 271 
Lesser peritoneal cavity, 344 
Ligamentum pectinatum iridis, 279 
Limiting sulci, 130 
Lingual glands, 306 
Lip-grooves, 304 
Liver, histogenesis of, 323; later de- 
velopment of, 319-323; origin and 
early development of, 179, 180, 
ISL; origin of lobes of, 322; pri- 
mary ventral ligament of, 335 
Lungs, 178, 326 
Maeula utriculi, saceuli, ete., 295 
Malpighian corpuscles (mesonephric) 
origin of, 195 
Mammillie of shell, 17 
Mandibular aortic arch, 
203, 204 
Mandibular arch, skeleton of, 431 
Mandibular glands, 306 
Mantle layer of spinal cord, origin 
of, 239 
Margin of overgrowth, 52, 57 
Marginal notch, 60, 84, 85 
Marginal velum, 235 
Marrow of bone, origin of, 410 
Maturation of ovum, 82 
Meatus venosus, 199, 364, 366, 368 
Medullary cords of suprarenal cap- 
sules, 405, 406 
Medullary neuroblasts of brain, 262 
Medullary plate, 95; position of an- 
terior end of, in neural tube, 102, 
103 
Megaspheres, 59 
Membrana reuniens, 418 
Membrane bones, definition of, 407 
Membranes of ovum, !0 
Membranous labyrinth, 289 
Meroblastic ova, 11 
Mesencephalon, LOS, 155, 251 
Mesenchyme, definition of, 116 
Mesenteric artery, 363 
Mesenteric vein, 366, 367 
Mesenteries, 333 
Mesentery, dorsal, 172, 342; of the 
vena cava inferior, 341 
Mesoblast, gastral, 110; of the head, 
origin of, 116, 117; history of be- 
tween | and 12 somites, 109; lat- 
eral plate of, 110, 115; of opaque 
area, origin of, 86, 8S; origin of, 
74, 78; paraxial, 110; prostomial, 
110; somatic layer of, 115; splanch- 
nic layer of, 115 
Mesobronchus, 326, 327 
Mesoeardia lateralia, 200, 207, 334, 
Sot 
Mesoeardium, origin of, 120 
121, 
122 
INDEX 
Mesogastrium, 309, 342, 343 
Mesonephrie arteries, 363 
Mesonephric mesentery, 341 
Mesonephric tubules, formation of, 
195 
Mesonephric ureters, 380 
Mesonephros, later history of, 378; 
origin and early history of, 194— 
197; see Wolffian body 
Mesothalamus, 251 
Mesothelium, definition of, 116 
Metacarpus, 486, 487, 488 
Metamorphosis, 11 
Metanephros, 384-389 
Metatarsals, 441 
Metathalarus, 251 
Metencephalon, 155, 251 
Mid-brain (see Mesencephalon) 
Mid-eut, 172, 181, 310 
Mouth, 301 
Millerian duets, 391; degeneration 
in male, 402, 403; origin of, 401, 
402, 403 
Muscles of iris, 274 
Muscle plate, 185, 186 
Myelencephalon, 155, 252 
Myoeardium, origin of, 119 
Myotome, L188 
Nares, 286 
Nephrogenous tissue, 195, 378; of 
metanephros, 384, 387 
Nephrotome, 114, 190 
Neural erest, 156 
Neural folds, 97, 99 
Neural groove, 97 
Neural tube, 95, 105 
Neurenteric canal, 73, 82 
Neuroblasts, 233-239; classes of, in 
spinal cord, 244 
Neurocranium, 427, 428 
Neuroglia cells, origin of, 239, 240 
Neuromeres, LOS, 148, 152, 155 
Neurone theory, 256, 255, 256 
Neuropore, 101, 105 
Notochord, later development of, 
411 ff; origin of, 80; in the region 
of the skull, 428 
Oblique septum, 331, 342 
Oculo-motor nerve, 265; nucleus, 
262, 263 
Odontoid process, origin of, 420 
Q£sophagus, 179, 310, 312 
Olfactory lobe, 247 
Olfactory nerve, 263 
Olfactory pits, 169, 285 
Olfactory vestibule, 285 
Omentum, development of, 343 
| Omphalocephaly, 120 
