Talk:Paper - The development of the cloaca in human embryos

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Tabulation

Tabulation of Material. + for transverse: = for sagittal: || for coronal. The figures following indicate the thickness in microns.

Online editor - Carnegie stages have been added to the original tabulation.
Embryo Mall Stage CRL Plane Thickness (microns) Quality Notes
No. 1 12 Carnegie stage 11 2.1 mm transverse 10 good Modelled by Mall ('97). Allantois of small lumen and in relation with the caudal border of the yolk sac. No evidences of a cloacal membrane.
No. 2 391 Carnegie stage 10 2.0 mm transverse 10 Good Appearance of hind gut. An interval of several sections between allantois and yolk sac. No cloacal membrane.
No. 3 164; 3.5 mm. ; transverse ; 20; Good). Model A. x 100. Cloaca well developed and limited for caudal half of the ventral border by epithelial cloacal membrane. Allantois comes off at right angles and at lower border of dermal navel. Lateral furrow along later line of division. Carnegie stage 11
No. 4 209; 3.0 mm. ; transverse ; 50; Fair). Relations about the same as the fore-going stage. Sections too thick for detailed study. Carnegie stage 12
No. 5 186; 3.5 mm.; transverse; 20; Good). Model B. x 100. Allantois wide lumened and no distinct line of demarkation from the ventral cloacal segment. Wolflian ducts have arrived but not as yet opened. Tail gut maximum of development. Probably the first signs of cloacal division. Carnegie stage 13
No. 6 87; 4.0 mm.; transverse; 20; Fair). About the same as the foregoing. Carnegie stage 13
No. 7 148; 4.3 mm. ; transverse ; 10; Good x 100). Wolffian ducts open into cloaca. Allantois of small lumen. Ventral cloacal segment widening. Evidences of division quite apparent. Carnegie stage 13
No. 8 (Mall. 76; 4.5 mm. ; transverse ; 20; Good). x 100. Widened ventral cloacal segment goes over indistinctly into allantois. Tail gut still quite large. Renal buds well developed. With exception of large allantois and wider tail gut, quite similar to Model C. Carnegie stage 13
No. 9 80; 5.0 mm; transverse ; 10; Good). Model C. x 100. About the same as the foregoing stage. Tail gut undergoing degenerative changes. Carnegie stage 14
No. 10 371; 6.6 mm.; sagittal ; 10; Good). Tail gut rudimentary. Development of cloaca and renal buds about the same as in no. 12. Carnegie stage 15
No. 11 116; 5.0 mm. ; sagittal ; 20; Good). x 100. Intracloacal epithelial plug well marked. Stage about the same as that found in no. 12. Carnegie stage 13
No. 12 2; 7.0 mm.; transverse; 15; Good). Model D x 100. Marked development of renal buds. Kidney and ureter segments evident. Ventral cloacal segment much widened. Allantois of narrow lumen. Intracloacal epithelial plug marked. Tail gut maximum in length and slightly widened at caudal end. Carnegie stage 15
No. 13 241; 6.0mm.; transverse; 10;Goo(l). Tailgutmore rudimentary than in no. 12. Cloacal membrane wide and shows intracloacal epithelial plug. Otherwise about the same as in no. 12. Carnegie stage 15
No. 14 383; 7.0 mm.; transverse," 10; Good). State similar to no. 12. Cloacal membrane intact. Carnegie stage 16
No. 15 397; 8.0 nma.; transverse; 10; Good). Similar to foregoing. Carnegie stage 16
No. 16 113; 8.0 mm.; sagittal; 10= Fair). x 100. Stage of cloacal division between than found in no. 12 and that found in no. 19. Cloacal membrane intact. Division of ureteral pelvis. Ureter segment elongated. Carnegie stage 15
No. 17 114; 10.0 mm.; sagittal; 10; Fair). x 100. Stage of cloacal division about the same as the foregoing. Cloacal membrane intact. Kidney a little higher up. Upper and lower pelvis evident.
No. 18 109; 11.0 mm.; transverse; 20; Good). Sections directly through lower part of cloacal region somewhat damaged. Otherwise about the same as no. 19. Carnegie stage 18
No. 19 221; 12.0 mm.; sagittal ; 20; Good). Model E x 100. All traces of tail gut lost. Cloacal membrane somewhat depressed from surface. Cloacal segment of Wolffian duct shortened and opening of ureter and duct common into ventral cloacal segment. Beginning formation of genital eminence and lengthening of the ventral cloacal wall. Cloacal membrane intact. Carnegie stage 16
No. 20 175; 13.0 mm.; transverse; 20; Good). x 100. Cloaca about divided. Complete double ureter. Orifices of lateral, and medial ureter and Wolffian duct at same level into cloaca.
No. 21 353 Carnegie stage 17 11.0 mm.; transverse; 10; Good). Cloaca completely divided. Anal and urogenital membranes intact. Ureteral orifice independent and on level with Wolffian opening.
No. 22 317 Carnegie stage 18 15.0 mm.; coronal; 20; Good). About the same stage as in no. 21.
No. 23 ; 10; Good). About the same as the foregoing, and no. 24.
No. 24 43 Carnegie stage 19 16.0mm.; sagittal ; 50; Good). Model F . x 50. Anal and urogenital membranes separated. Genital eminence more marked. Ectodermic inclusion in furrow on caudal surface. Ureteral orifice on same level but some distance lateral to Wolffian orifice.
No. 25 256 Carnegie stage 20 16.0 mm.; sagittal ; 50; Good). Urogenital sinus open to outside through rupture of urogenital membrane. Kidney nearly up to normal position and rotated.
No. 26 296 Carnegie stage 18 7.0mm.; coronal;20; Good). Slightly older than above. Appearance of secondary genital folds at the sides of the phallus.
No. 27 128 Carnegie stage 21 20.0 mm.; coronal; 50; Good). About same as above.
No. 28 240 Carnegie stage 20 20.0 mm.; coronal; 20; Good).
No. 29 22 Carnegie stage 21 20.0 mm.; transverse; 50; Good). One Mullerian duct has reached the urogenital sinus.
No. 30 (Embryo KP; 22.0 mm.; transverse; 15; Good). X 66. Both Mullerian ducts at sinus.