IN 
Atrium burs omentalis, 344 
DEX 
Abducens nerve, 267 Auditory nerve, 295; ossicles, 299, 
Abducens nucleus, 262, 263 432; pit, 168 
Abnormal eggs, 25 Auricular canal, 354 
Accessory cleavage of pigeon’s egg, | Auriculo-ventricular canal, 348; di- 
38, 48, 44 vision of, 355 
Accessory mesenteries, 340, 341 Axis, development of, 420 
Acustico-facial ganglion complex, 159 | Axones, origin of, 235 
160, 262, 268 
Air-sacs, 326,a30n0a1 Basilar plate, 429 
Albumen, 18 Beak, 302, 304 
Albumen-sac, 217, 224 Biogenesis, fundamental law of, 4 
Albuginea of testis, 397 Blastoderm, 17; diameter of unin- 
Alecithal ova (see isolecithal) cubated, 61; expansion of, 50, 53, 
Allantois, blood-supply of, 222; gen- 61 
eral, 217; inner wall of, 220: neck Blastopore, 55, 82 
of, 148, 144, 316; origin of, 143, | Blood-cells, origin of, 118 
144; outer wall of, 220; rate of | Blood-islands, origin of, 86, 89 
growth, 221; structure of inner | Blood-vessels, origin of, 118 
wall, 223; structure of outer wall, Body-cavity, 115, 205-210, 333 
223 Bony labyrinth, 296 
Amnion, effect of rotation of em- | Brain, primary divisions of, 108; 
bryo on, 140, 141, 142; functions early development of, 147, 156; 
of, 231; head fold of, 137, 139; later development of, 244-252 
later history of, 231; mechanism Branchial arch, first, skeleton of, 432 
of formation, 139, 140; muscle | Bronchi, 325, 326 
fibers of, 231; origin of, 135; see- | Bulbus arteriosus, 198, 201, 202, 348; 
ondary folds of, 142 fate of, 357 
Amnio-cardiae vesicles, 92, 116 Bursa Fabricii, 314, 317, 319 
Ampulle of semicircular canals, 291 Bursa omenti majoris, 344 
Anal plate, 143, 182 Bursa omenti minoris, 344 
See also cloacal membrane 
Angioblast, 88 Canal of Schlemm, 279 
Anterior chamber of eye, 278 Cardinal veins, anterior, 200, 204, 
Anterior commissure of spinal cord, 205, 363; posterior, 200, 204, 205, 
origin of, 244 368 
Anterior intestinal portal, 95 (Fig. | Carina of sternum, 427 
49), 121, 132 Carotid arch, 361 
Anterior mesenteric artery, 363 Carotid, common, 362; external 359, 
Aortic arches, 198, 199, 203, 358- 361; internal, 359-361 
362; transformations of, 359-361 Carpus, 436, 437 
Appendicular skeleton, 434 Cartilage, absorption of, 408; bones, 
Aqueduct of Sylvius, 251. definition, 407; calcification — of, 
Archenteron, 55 409 
Area opaca, 39, 50, 61, 86; pellu- | Caval fold, 344 
cida, 39, 50, 61; vasculosa, 61, 86; | Cavo-caliace recess, 344 
vitellina, 61, 62, 86 Cavum sub-pulmonale, 342 
Arterial system, 121, 126, 198, 199, | Cell-chain hypothesis, 255 
203, 204, 228, 358-363 Cell theory, 1 
Atlas, development of, 420 Central and marginal cells, 41, 42 
Central canal of spinal cord, 242 
465 
