646 



INDEX 



Mandibular process, 112, 118, 119, 287 



layer of neural tube, 455, 472. 484, 497, 



500, 512, 524 

 Manubrium sterni, 154 



Marchand's fusion theory of symmetrical 

 duplicity, 607 



scheme of duplicate monsters, 60 1 

 Marginal furrow of His, 479 



layer of neural tube, 449, 484, 497, 500, 512 

 Mark and Long, concerning maturation, 18 

 Marrow, 145 



cavity, primary, 141 



formation of blood cells in, 240 



red, 146 



spaces, primary, 139 



yellow, 146 



Marsupials, early nutritional conditions in, 576 

 Masculine false hermaphroditism, 404 

 Massa intermedia, 505 

 Mastoid process, 159 

 Maternal impressions, 620 

 Maturation, n 



comparison of in male and female, 19, 20 



in mammals, 84 



of the ovum, 16 

 in Ascaris, 17 

 in the mouse, 18 



significance of, 20 



of the sperm, 1 1 

 Maxilla bone, 162 

 Maxillary process, 112. 118, 287 

 McMurrich, concerning derivation of the 

 dermis, 408 



concerning umbilical cord, 597 

 Mechanical theory of monsters, 621 

 Meckel's cartilage, 157, 162. 164 



diverticulum, 308, 581 

 Medial fillet, see Fillet, medial 



geniculate bodies, see Geniculate bodies 



lemniscus, see Fillet, medial 



longitudinal fasciculus, 436, 474, 481, 486, 

 487 



nasal process, 120 

 Mediastinum testis, 383 

 Medulla oblongata, 447, 482 



taenia of, 483 

 Medullary cords, 376, 377 



layer of telencephalon, 512, 524 



sheath, see Myelin sheath 

 Megakaryocytes, 242 

 Megaloblasts. 241 

 Meibomian glands, 548 

 Meiolecithal ova, 5 



Meissner, plexus of, 461 



tactile corpuscles of, 408 

 Membrana preformativa, 294 



tectoria, 558 



Membrane bones of the skull, 160 

 Mendelian inheritance, 9 

 Mendel's law of segregation, 21 

 Meningocele, 613 

 Meningoencephalocele, 613 

 Menstruation, 25 



relation to ovulation, 25 

 Merorachischisis, 614 

 Mesencephalon (mid-brain), 424, 445 

 Mesenchyme, 133 

 Mesenterial small intestine, 307 

 Mesenteries, 340, 347, 350 



anomalies of, 352 

 Mesentery of the jejunum, 350 

 Mesoappendix, 351 

 Mesocardium, dorsal, 196, 342 



ventral, 196, 342 

 Mesocolon, ascending, 351 



descending, 351 



sigmoid, 351 



transverse, 350 

 Mesoderm, derivatives, from, 1 29 



development of, 41, 59, 77, 93, 95 

 in Amphioxus, 41, 42, 44, 46 

 in the chick, 77, 78, 79, 80, 81 

 in the frog, 59, 60, 61, 64 

 in Mammals, 93, 108 

 in primates, 95, 96 



gastral, 43, 6 1 



parietal, 45, 60, 80, 81, 96, 98. 108 



peristomal, 43, 6 1 



visceral, 45, 60, 80, 81, 96, 98, 108 

 Mesodermal somites, 43, 45, 47, 60, 65, 79 80, 



81, 82, 96, 98, 104, no 

 Mesoduodenum, 350 

 Mesogastrium, dorsal, 304, 347 



ventral, 305, 347 

 Mesolecithal ova, 5 

 Mesonephric duct, 356 



mesentery, 388 



ridge, 355, 358 

 Mesonephroi, atrophy of, in the female. 385 



in the male, 386 

 Mesonephros, 356 



Bowman's capsule, 357 



degeneration of, 360 



diaphragmatic ligament of, 359, 388 



disappearance of, 360 



function of, 359 



