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47 I'leurulation showed a comparable series of changes characterîstìc of each region în each group of control embryos. These changes Ìn the crosssectîonal shape of neural tissue were described as: a) closed neural tube O b) closíng neural rube C) c) inverted neural folds (-) d) elevated neural folds tJ e) everted neural folds --.\ñ f) flattened neural plate -vln thís way the normal progress of neurulation could be closely deflned for each group of embryos in terms of six regions, (Tabtes 3 -6 ).
48 TABLE 3. srAGE t0 El,tBRyos (cnoue | ¡ Reg.i ons l4a rke rs A) forebrain (short) opt ic veslcle J midbraln I hlndbraln t presomlte area (short) f 1 no notochord J I neural tube closed or closìng, notochord, pharynx, heart, head mesenchyme, anterior intestinal Porta I ' B) upper somite area I neural folds closing or inverted, lower somite area Þ J notochord, somites. C) protosomî te a reê neuraI folds înverted, notochord, protósom i tes . D) anteríor rhomboid sinus neural .folds elevated, notochord, unsegmented mesoderm. E) poster¡or rhomboid sinus neural folds elevated or flattened, protonotochord, fused mesoderm. F) Hensenrs node deep primîtive pit, developinþ neural t i ssue. prlmitive s t reak shal low primitive groove, no neural t l ssue,
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E}4BRYOGENES IS OF EXPERIHENTALLY I
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MY PARENTS c.J.H. G. M.
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lt Congenital malformêtlons of the
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TABLE OF CONTENTS SECT ION PAGE 1 I
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},I.ATE R I ALS 3.1 THE CHICK EI4BR
Page 11 and 12: vt I I 6.3.2 Stage 10 Experímentel
Page 13 and 14: 9 APPENDTCES 378 APPENDIX A . 379 1
Page 15 and 16: 1.1 TERATOLOGY Birth defects have a
Page 17 and 18: 4 of the complexity of normal devel
Page 19 and 20: 6 flat, exposed plaque of neural ti
Page 21 and 22: 8 However, several early embryos in
Page 24 and 25: .1- 5
Page 26 and 27: l2 2.1 ErI0L0rL!! fïE qYs34t!1!!jr
Page 28 and 29: 4 which has rema¡ned fairly consta
Page 30 and 31: 6 and about 112 after two (Laure,nc
Page 32 and 33: l8 ln some very early human embryos
Page 35 and 36: 2l and kinky-ta¡l as disorders of
Page 37 and 38: 23 Vogel and McClenahan (1952) tnus
Page 39 and 40: I'IATE R IALS 25
Page 41 and 42: 27 lf necessary, eggs were stored a
Page 43: FÍg. 5. lncubator allowing precise
Page 46 and 47: 3l 4. r sELEcr I oN !F EGGq 4.1,1 .
Page 48 and 49: uler. Accurate Staging (Hamburger a
Page 50 and 51: .\lz '?. t
Page 52 and 53: Fis. I AsB, Windowìng followed by
Page 55 and 56: Fis. 9 Aã8. t/indow?ng followed by
Page 57 and 58: 42 ( \--l /) ^ ) t0
Page 59 and 60: 44 serîal sectlonlng a camera luci
Page 61: 46 Thus the embryos selected for se
Page 65 and 66: 50 TABLE 5 , Reg i ons srAGE 13:16'
Page 67 and 68: 52 4.8.4 HistologÌcal_De:plþtÍon
Page 69 and 70: 5 RESULTS OF TERAÎOLOGICAL PROCEDU
Page 71 and 72: (c) deaths and defects in the survi
Page 73 and 74: Fi g. Percentagcs of early deaths a
Page 75 and 76: 6o MoRTALtTY, AFTER ì,'tNpowtNq,AT
Page 77 and 78: TABLE B.'DEVEIOPI{ENT'AFTER'WINDOIi
Page 79 and 80: TABLE 9. ¡4ALFORMATIONS PRODUCED'B
Page 81 and 82: N=231 ffil e ooyi ffi s oays [il t2
Page 83 and 84: 6B TABLEt loj lloRTALtTy AFTER VtBR
Page 85 and 86: 70 5,3.2 Pa-rôf i Idì ¿irid PIè
Page 87 and 88: TABLE 13; MALFORI4ATIONS AFTER PLAS
Page 89 and 90: 41 13 0 23 No l^l i ndow Control s
Page 91 and 92: Fíg. Percentages of early deaths a
Page 93 and 94: 78 ALBUMEN INTRODUCTION Analysís o
Page 95 and 96: 0 1 0 0 a o TABLE 17. I'lALF0RÌ1AT
Page 97 and 98: N Eorly Deothi N=10ó N a ú, o d,
Page 99 and 100: 103 51 52 28 14 4 6 No W î ndow Co
Page 101 and 102: Fi g. 14. Percentages of early deat
Page 103 and 104: 88 AtR qELL, REEXPANSI0N Analysls o
Page 105 and 106: 90 5.4 BACTERt4L CUTTURE 0F UlNpohr
Page 107 and 108: 92 TABLE 22. ¡¡UI'ISELTS OF PLATE
Page 109 and 110: 94 6.1 EMBRY0ûIIES I s 0L 0!!\- NE
Page 111 and 112: Fis. I5 A¿8, Range of s izes (mm.)
Page 113 and 114:
Figs. 16 AaB.. Range of sizes (mm.
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100 6.1.2 f4ortal í!y with Vsrying
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421.. 26 25 I (3.85) 20 (76 .92) 1
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00 N Eorly Deoths ,n -¡ F- ô- xu.
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ì06 Degrees of Freedom 12 Chi Squa
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hzE 53 42C z5 51(96.4)2\(96) 2(3.77
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ffil Op"n Anterior Neuropore I I0 N
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N=380 El Ovol Rhonnboid 'Sinus ì l
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Øl Open Broin Defecls N=384 ffi F"
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ligr. 21 - 30. Camera lucida drawin
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Fi s. 22. lrregular open anteríor
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lmm OPEN BRAIN DEFECT Á,NOPHTHALMI
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lmm OVAL RHOMBOID S¡NUS 48 HOURS S
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FiS. 26, Open neural folds extendin
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t-l lmm IATER OPEN CORD DEFECT . RE
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l2B t--l lmm EARLY OPEN CORD DEFECT
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Fis. 30. Large caudal cyst Ìn an o
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132 6.1 .4 DeveloÞñent of oÞen N
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Fig. 31 . Percentêges of experinen
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36 TABLE ?8. RH0I4B0lD stNUs ctôs
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N=38o H ovol Rhomboid sinus l^ r38
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F¡ S. 33. Percentages Õf open cor
Page 157 and 158:
142 6.1.5 Distríbution of 0pen Cor
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Fi s. "l! Percentage distrìbution
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lrregul ar (Z) somi te be low level
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ì48 N=2ó4 ffi m Regulor Cord Defe
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Fis. 36. Percentage distrîbution o
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152 6.2 sPtIA! LFVELS 0F oPEN CORp
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Fìgs. 37'38, Vertebral defecrs in
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CERVICAT THORACIC LUMBAR FUSED CAUD
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---l r r'I * 40
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t59 a) spîna bif¡da occulta is se
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:al . '**Ç- 4 ff, À(,) ftø 9-' o
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162 lmnediately after closure, sepa
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164 Hensenrs node and the primitive
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-l :: l 48 I 49 i :. t: .lì 50 ì:
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t67 somite area (through asymmetry
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t69 ln both embryos the volume of n
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171 The rhomblc roof became membran
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173 At areas of myeloschisîs conta
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175 neurêl tîssue wíth mesoderm
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t77 e) encroachment of somitîc mes
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ôt rf) , ,,. ì _ ^iiir¡:ù\. I r
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l 55 56 57 58 59 ó0
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Fiss. 65 Early myeloschisis in a St
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fiSr. 71 - 76. Later myeloschisis i
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Fiss. 77 -82. Early myelodysplesia
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FÌgs. B3 - BB. Later myelodysplas
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Figs, 89 - 91. Processíng artifact
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ì86 6.3.10 SequenJ¡¿il ll lúSti
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Fígs. 95 - 102, Sequentiêl drawin
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l9o EVERsToN: srAGE rf (o r o+) o @
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@ @@ "@ @ e q q a a 192 CoNTROL: ST
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MYELOSCHTSTS: STAGE tZ (tZeïl OOG
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coNTRO[: STAGE tó (ro c zz) . a@ Q
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G (õ--==: \z-- HEMTMYELIA: STAGE t
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Som i te Defects contact none sePa
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Somite Som i te Contact Defects N'
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Som i te Contact Som i te Defects c
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none none N) o o\ B r8c 23 12 good
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separat ion none contact/ none sepa
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Regíon Embryo Stage Conditîon Neu
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none none none none none none l'.J
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18E 10 13- vëry poor closed 0 cove
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separãtion none contact none conta
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Regíon Embryo Stage Condition Neur
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separation none sepâ ra t îon non
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separâtion none sepa ra t ion sepa
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Reglon Embryo Stagd cond¡t¡on Neu
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none none none none N) NJ .{ A A A
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contact/ none separatlon contact no
Page 256 and 257:
Region Embryo Stage Conditlon Neura
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TABLE 38D. STAOE 17.20 CONTROL AND
Page 260 and 261:
Reglon Embryo Stage Condition Neura
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428 72 20 closed covered none conta
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239 neural tissue ât the later sta
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241 The control group (Table 99 ) s
Page 268 and 269:
TABLE 39. APPEARANCE OF I,'HOLE EI4
Page 270 and 271:
TABLE 40. APPEARANCE OF }/HOLE EI"I
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closed closed c I osed c I osed c I
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249 6.6 pEVEL0PMENT 0F rH!_¡Ho|4gl
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Emb ryo Stage Rhombîc Roóf Neural
Page 278 and 279:
CDE D'E DE CDE DE DE DE D BCD BC BC
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TABLE q6,. STAGE 17-20 CoNTRoI AND
Page 282 and 283:
Figs- 10J - i11. Development of the
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Fî s. tub. Thick rhombic roof in 5
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Fig. 109 Hernbranous rhombic roof w
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260 6.7 HrqroLoctcAL, cHANgË Assoc
Page 290 and 291:
TABLE 47. CONTROL EMBRYoS.HISTOLOGI
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0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 0 0 N
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42c 21 zo B c D E 0000 00 00 00 1\.
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l\t q\ 1oE 26 16 30E 59 16 3oE 77 1
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0 0 0 0 0 0 0 0 0 0 0 0 N) .{ Embry
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l\) \l N D E 00 00 0 0 13.79 0 100
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N) \¡ \2E 72 20 E B c D' E 00 0 15
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46. 15 76.92 0 20.51 14.83 2i,92 53
Page 306 and 307:
ECTODERM DISCONTINUITY IN EXPERIMEN
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279 ECTODERM DISCONTINUITY IN EXPER
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SOMITE SEPARATION IN EXPERIMENTAL E
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283 NOTOCHORD SEPARATION IN EXPERIM
Page 314 and 315:
285 SOMITE DEFECTS IN EXPERIMENTAL
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287 and distr¡bfrtíon in the cont
Page 318 and 319:
19.09 r8.95 r 1.84 14.82 15.20 0 17
Page 320 and 321:
0 15. 89 81 .08 100 100 ' 76.92 0 1
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43. rB 100 100 0 12.53 74.07 r00 't
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7.t6 16.03 100 100 160 7.90 18.22 r
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Figs. 120'123. Percentage ie.ngths
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299 O\TERLAP ZONE IN EXPERIMENTAL E
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301 OVERLAP ZONE IN EXPERIMENTAL EM
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303 ând every tenth sectlon was ne
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30c 12 16 c 17707,61 2463.3\ 7.19 D
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Ratio NT/N 4 .90 4.11 6.17 7.14 6.9
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Rêtlo NT/N 4.go \.36 3 .44 3. 18 3
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6.7t 6.lt 4.63 4.60 4.13 3.48 hzE 5
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Fi9s, 124-127, Neurál tube-norocho
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315 NEURAL TUBE -NOTOCHORD RATIOS I
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317 NEURAL TUBE-NOTOCHORD RATIOS IN
Page 348 and 349:
319 TABLE 598 ' ANALYSIS OF VARIANC
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321 TABLE 61., .NEURAL TISSUE/NOTOC
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323 Apart f.rom the sîgnîficant d
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t25 7. Dlscusst0N 1'/i th progressi
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327 C¡osure of the anterior neurop
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329 the mid-polnts of the defects w
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331 'c¡osure of the neural folds w
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333 . These findings s.ugges r that
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335 Lendon (1968, 1975) and notos (
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337 Ferm, 1965; l"larin-Padi r ¡a,
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339 Kôplan (1965) and Kaplan and G
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341 reach the floor-plate; asymmetr
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343 took up the label, shovri.ng th
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345 The defects in early human embr
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347 after pred¡cted closure (Lemî
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349 hours could provide evidence fo
Page 380 and 381:
351 t971), Gal lus and Xenopus (l'l
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353 1962i 1965). Barth and Barth.(1
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The result of any teratogen¡c insu
Page 386 and 387:
357 Uindowîlg at ear¡y stages of
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SUHHARY AND CONCLUS I ONS
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361 separatlon between the neural p
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363 APPENDIX A Preparatlon of Early
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365 APPENDIX B Stainl.ng of Carti l
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367 10, BIBLIOGRAPHY, Alter, l.,l.
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369 Braun, l'{. (1882). entwicklung
Page 400 and 401:
371 Crlley, B,B.(1969). Analysîs o
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373 dqs anomal ies de lrorganizatio
Page 404 and 405:
375 Heath, H.D., Shear, H.H., lm€
Page 406 and 407:
377 Jel inek, R. (1960). Developmen
Page 408 and 409:
379 Laurence, K.14. (1964). Thé na
Page 410 and 411:
381 McKeown, T. and Record, R.G.(19
Page 412 and 413:
Penrose, L. S.(1957). Genetics of a
Page 414 and 415:
385 Russell, H.E. and A¡ tken' G.T
Page 416 and 417:
387 Spemann, H. (1938). Embryonic D
Page 418 and 419:
389 lJeed, ¡.H. (1937 -38'). M.nin
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