Talk:Paper - A Young Human Embryo (Embryo Dobbin) with Head-Process and Prochordal Plate

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Contents.

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . § . 443

History And Treatment On The Specimen . . . . . . . . . . . . . . . . . . . . . . 444

The Embryo As A Wi{Ole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445

Embryonal Area . . . . . . . . . . . . . . . . . . . . . . .6 . . . . . . A . . . . . . 44-8

(I) Head-Process And Proceordal Plate . . . . . . . . . . . . . . . . . . . . . 448

(Ii) Mesoderm, Primitive Streak And Cloacal Membrane . . . . . . . P. . . . . 457

Yolk-Sac . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . 459

Allantoio Canal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 459

Connecting Stalk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . § . . . . . 461 ‘

Oiiorion . . . . . . . . . . ’ . . . . . . . . . . P . . . . . . . . . . . . . . . . . . . 463

Technique Or The Reoonstructions . . . . . . . . . . . .' . . . . . . . . . . . . . 463

Development Of The Head-Process And Proohordal Plate In Man . . . . . . . . . . . ~ 465

(Ct) Discussion Or Speoimens Ti-Ius Far Known . . . . . . . . . . . . . . . . . . 465

(B) Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479

List Of References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 483

Explanation Of The Plates . . . . . . . . . . . . . . . . . I . . . . . . . . . . . . 484

==MEASUREMENTS of some Human Embryos of

(Measurements made by FLoRIAu indicated by

Name of the Specimen.

Embryo 1?. Meyer,

Embryo “ Hugo ”

Embryo

Embryo No. 1285 of the Manchester

1924. T (STIEVE, 1926). Bi(ttmann) 24. . 001180 tion Cher-ionic Vesicle, including villi 3-9 : 2-5 : 3-77 . 5-6 : 6-4 : 5-9 -— - Chorionic cavity 2-6 : 2-1 : 2-72 . 4-4 : 4-7 : 3-8 ——- —-— Amniotic cavity . O-41:0-3:0-2 . 1 20-615 i(136X‘l3- -—- l 2:50-91 fig. 11) h =-_- 0-17 (FLORIAN -~— in = 0-23 1930b, fig. 6) w = 0-63 (text-fig. 3) Length (including 0-41 (no cloacal 0-635 (text—fig. 11) 0-625 (text-fig. 12) 0 -87 (text-fig. 13) cloacal mem- membrane de- A Embryonal brane) scribed) ‘ shield* ~ T

[Width . 0-4 . 0-6-30 (text—fig. 3) -——-— 0-625 (text-fig. 5)

(Cloacal membrane Not observed . 0-035 (text-fig. 11) .0-06' (text-fig. 12) 0-00 (text-fig. 13)

I

Primitive streak 0-12 to . 0-245 (teXt—fig. 11) 0-23 (teXt—fig. 12) 0-30 (text-fig. 13)

g ' 0

| Hensen’s knot Not measured 0-05 (text-iig. 11) 0-05 (teXt—fig. 12) 0-05 (teXt—fig. 13) Length* of

the »

I Head-process 0-O6 . 0-07 (or 1-10 ?) (text— 0-105 (text-fig. 12) 0-125 (teXt~fi.g. 13)

fi fig. 11)

l

[ Prochcrdal plate Not described . (0-04? ; text-fig. 11), 0-03 (text-fig. 12) 0-03 (teXt~fig. 13)

5 probably not yet developed

Yollcsac l 2 0-625 -«

. 0-56 : 0-38 2 0-55...

h = 0-565 (ll-1‘.I.1ORIA1\1. 1930b, fig. 6)

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