. 2020 Jun 29;237(4):655–671. doi: 10.1111/joa.13230

Table 1.

Metadata of human embryos and foetuses that were studied

Stage	Days	Embryo	Fixation	Staining	Plane	Source
CS10	28	S6330	Formalin	Ehrlich's H	Transv	DREM
CS11	29	S6344	Formalin	CA	Transv	DREM
CS12	30	S8943	Zenker's fix	H & E	Transv	DREM
CS13	32	S836	HgCl₂	CA	Transv	DREM
CS14‐early	33	S2201	Formalin	H & A	Transv	AMC
CS14‐mid	34	S5029	Formalin	H & A	Sagittal	AMC
CS14‐mid	34	S168	Bouin's fix	H & E	Transv	LUMC
CS14‐mid	34	1950‐09‐13		H & E	Sagittal	Göttingen
CS14‐late	35	1958‐12‐22		H & E	Sagittal	Göttingen
CS14‐late	35	1961‐06‐13		H & E	Transv	Göttingen
CS14‐late	35	S6502	Souza's fix	H & E (or + Ag)	Transv	DREM
CS15‐early	36	S721	Zenker's fix	H & E (or + Ag)	Transv	DREM
CS15‐early	36	S79	Formalin	H & E	Transv	LUMC
CS15‐early	36	1945‐10‐26		H & E	Transv	Göttingen
CS15‐early	36	1957‐10‐31		H & E	Transv	Göttingen
CS15‐late	37	S2213	Formalin	H & A	Transv	AMC
CS16	39	S5032	Formalin	H & A	Sagittal	AMC
CS16	39	S6517	Corrosive CH₃COOH	CA	Transv	DREM
CS16	39	S39	Formalin	H & E	Transv	LUMC
CS17	41	S6520	Corrosive CH₃COOH	CA (or + Ag)	Transv	DREM
CS18‐early	43	S97	Bouin's fix	H & E	Transv	LUMC
CS18‐late	45	S4430	Corrosive CH₃COOH	CA	Transv	DREM
CS19	46	S9325	Acetic formalin	Azan & Ag	Transv	DREM
CS20	49	S2025	Bouin's fix	H & A	Transv	AMC
CS20	49	S462	Formalin	CA	Transv	DREM
CS20	49	S34	Formalin & Bouin's fix	H & E	Sagittal	LUMC
CS21	51	S4090	Formalin	CA	Transv	DREM
CS22	53	S48	Formalin	H & E	Transv	LUMC
CS22	54	S983	Formalin	H & E	Transv	DREM
CS23	56	S4141	Formalin	H & A	Transv	AMC
CS23	56	S9226	Formalin	Azan	Transv	DREM
CS23	56	S88	Formalin & Bouin's fix	H or PAS or Azan	Sagittal	RadboudMC
9 weeks	63	S89	Formalin	H & E or Azan	Transv	LUMC
9.5 weeks	67	S57	Formalin	H & E	Transv	LUMC

The estimated post‐fertilisation ages of the embryos are based on (O'Rahilly and Müller, 2010). The additions ‘early’, ‘mid’ and ‘late’ are meant to indicate that, within these stages, the development of the gut and enteric nervous system of ‘late’ embryos was more advanced than that of ‘early’ embryos.

The corresponding age was chosen from the range of developmental days attributed to that stage (O'Rahilly and Müller, 2010).

CS14 in particular is noted for its remarkable number of developmental events.

Abbreviations: AC, alum cochineal (i.e. carmine); AMC, Academic Medical Centre; CS, Carnegie stage; DREM, Carnegie collection from the Digitally Reproduced Embryonic Morphology project; Göttingen, Department of Anatomy and Embryology, Göttingen; H&A, haematoxylin and azophloxine; H&E haematoxylin and eosin; LUMC, Leiden University Medical Centre; PAS, periodic acid–Schiff stain; RadboudMC: Radboud Medical Centre.