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Archenteron

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533: 109: 120:—thin fibers formed by the mesenchyme cells, found in late gastrulation—contract to drag the tip of the archenteron across the blastocoel. The endoderm of the archenteron will fuse with the 574: 192: 82: 89:. The cells continue to be rearranged until the shallow dip formed by invagination transforms into a deeper, narrower pouch formed by the 567: 593: 598: 219: 560: 124:
of the blastocoel wall. At this point gastrulation is complete, and the embryo has a functional digestive tube.
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in the gastrula and enter the fluid-filled cavity in the center (the
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The indentation that is actually formed is called the lip of the
477: 268: 253: 157: 44: 171:, the archenteron develops into the digestive tube, with the 127: 81:), the remaining cells at the vegetal pole flatten to form a 153: 145: 585: 112:The archenteron is labeled as the digestive tube 101:. The open end of the archenteron is called the 568: 213: 164:(also known as Hensen's node), respectively. 160:. Each is controlled by the dorsal lip and 58: 16:Anatomical structure in a developing embryo 575: 561: 220: 206: 128:Similar formation process in other animals 35:, is the internal cavity of the primitive 107: 586: 201: 175:developing into either the mouth (in 527: 13: 14: 610: 186: 531: 1: 594:Animal developmental biology 547:. You can help Knowledge by 7: 599:Developmental biology stubs 505:Splanchnopleuric mesenchyme 450:Splanchnopleuric mesenchyme 229:Human embryonic development 10: 615: 526: 62: 458: 440: 402: 342: 329: 302: 236: 510:Somatopleuric mesenchyme 422:Somatopleuric mesenchyme 231:in the first three weeks 59:Formation in sea urchins 29:primitive digestive tube 47:. It develops into the 43:in a developing animal 394:Regional specification 113: 73:cells detach from the 37:gastrointestinal tract 541:developmental biology 500:Intraembryonic coelom 111: 63:Further information: 99:convergent extension 179:) or the anus (in 114: 71:primary mesenchyme 39:that forms during 23:, also called the 556: 555: 524: 523: 520: 519: 249:Oocyte activation 606: 577: 570: 563: 535: 528: 412:Surface ectoderm 375:Primitive groove 356:Primitive streak 340: 339: 222: 215: 208: 199: 198: 150:primitive streak 614: 613: 609: 608: 607: 605: 604: 603: 584: 583: 582: 581: 525: 516: 454: 436: 398: 331: 325: 304: 298: 289:Inner cell mass 232: 226: 189: 130: 67: 61: 55:of the animal. 17: 12: 11: 5: 612: 602: 601: 596: 580: 579: 572: 565: 557: 554: 553: 536: 522: 521: 518: 517: 515: 514: 513: 512: 507: 502: 492: 487: 486: 485: 480: 470: 468:Axial mesoderm 464: 462: 456: 455: 453: 452: 446: 444: 438: 437: 435: 434: 429: 424: 419: 414: 408: 406: 400: 399: 397: 396: 391: 390: 389: 379: 378: 377: 372: 366:Primitive node 363: 348: 346: 337: 327: 326: 324: 323: 318: 312: 310: 300: 299: 297: 296: 291: 286: 281: 276: 271: 266: 261: 256: 251: 246: 240: 238: 234: 233: 225: 224: 217: 210: 202: 196: 195: 188: 187:External links 185: 162:primitive node 129: 126: 60: 57: 15: 9: 6: 4: 3: 2: 611: 600: 597: 595: 592: 591: 589: 578: 573: 571: 566: 564: 559: 558: 552: 550: 546: 543:article is a 542: 537: 534: 530: 529: 511: 508: 506: 503: 501: 498: 497: 496: 495:Lateral plate 493: 491: 488: 484: 481: 479: 476: 475: 474: 471: 469: 466: 465: 463: 461: 457: 451: 448: 447: 445: 443: 439: 433: 430: 428: 425: 423: 420: 418: 417:Neuroectoderm 415: 413: 410: 409: 407: 405: 401: 395: 392: 388: 385: 384: 383: 380: 376: 373: 371: 367: 364: 362: 361:Primitive pit 359: 358: 357: 353: 350: 349: 347: 345: 341: 338: 335: 328: 322: 319: 317: 314: 313: 311: 308: 301: 295: 292: 290: 287: 285: 282: 280: 277: 275: 272: 270: 267: 265: 262: 260: 257: 255: 252: 250: 247: 245: 244:Fertilization 242: 241: 239: 235: 230: 223: 218: 216: 211: 209: 204: 203: 200: 194: 191: 190: 184: 182: 181:deuterostomes 178: 174: 170: 165: 163: 159: 155: 151: 147: 143: 139: 135: 125: 123: 119: 110: 106: 104: 100: 96: 92: 88: 84: 83:vegetal plate 80: 76: 72: 66: 56: 54: 50: 46: 42: 38: 34: 33:primitive gut 30: 26: 22: 549:expanding it 538: 490:Intermediate 432:Neural crest 387:Gastrulation 351: 169:gastrulation 166: 131: 115: 87:invagination 75:vegetal pole 68: 65:Gastrulation 41:gastrulation 32: 28: 24: 20: 18: 427:Neurulation 352:Archenteron 344:Germ layers 294:Trophoblast 177:protostomes 21:archenteron 588:Categories 483:Somitomere 370:Blastopore 334:Trilaminar 284:Blastocyst 279:Blastocoel 274:Cavitation 264:Blastomere 173:blastopore 148:, and the 142:amphibians 138:dorsal lip 134:blastopore 103:blastopore 79:blastocoel 25:gastrocoel 316:Hypoblast 307:Bilaminar 118:filopodia 473:Paraxial 460:Mesoderm 442:Endoderm 404:Ectoderm 382:Gastrula 321:Epiblast 259:Cleavage 122:ectoderm 95:endoderm 91:gastrula 53:mesoderm 49:endoderm 330:Week 3 303:Week 2 193:Diagram 167:During 158:mammals 136:or the 31:or the 478:Somite 269:Morula 254:Zygote 237:Week 1 45:embryo 27:, the 539:This 154:birds 545:stub 156:and 146:fish 144:and 116:The 51:and 19:The 183:). 152:in 140:in 93:'s 69:As 590:: 105:. 576:e 569:t 562:v 551:. 368:/ 354:/ 336:) 332:( 309:) 305:( 221:e 214:t 207:v

Index

gastrointestinal tract
gastrulation
embryo
endoderm
mesoderm
Gastrulation
primary mesenchyme
vegetal pole
blastocoel
vegetal plate
invagination
gastrula
endoderm
convergent extension
blastopore

filopodia
ectoderm
blastopore
dorsal lip
amphibians
fish
primitive streak
birds
mammals
primitive node
gastrulation
blastopore
protostomes
deuterostomes

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