Timeline Comparisons

Embryology - 26 Apr 2024        Expand to Translate
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Introduction

The Timeline human development has a specific page. This page attempts to bring together many different systems and species timelines

Respiratory Development

Respiratory Stages - Species Comparison - Stages Gestational age (days)
Species	Term	Embryonic	Pseudoglandular	Canalicular	Saccular
human	280	< 42	52 - 112	112 - 168	168
primate	168	< 42	57 - 80	80 - 140	140
sheep	150	< 40	40 - 80	80 - 120	120
rabbit	32	< 18	21 - 24	24 - 27	27
rat	22	< 13	16 - 19	19 - 20	21
mouse	20	< 9	16	18	19
Data modified from    Links: respiratory | Respiratory Comparison | Mouse Human Respiratory | Mouse respiratory stages | mouse | rat | rabbit | Timeline Comparisons

Embryonic Age

Species Embryonic Comparison Timeline

Carnegie	Stage	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Human	Days	1	2-3	4-5	5-6	7-12	13-15	15-17	17-19	20	22	24	28	30	33	36	40	42	44	48	52	54	55	58
Mouse	Days	1	2	3	E4.5	E5.0	E6.0	E7.0	E8.0	E9.0	E9.5	E10	E10.5	E11	E11.5	E12	E12.5	E13	E13.5	E14	E14.5	E15	E15.5	E16
Rat	Days	1	3.5	4-5	5	6	7.5	8.5	9	10.5	11	11.5	12	12.5	13	13.5	14	14.5	15	15.5	16	16.5	17	17.5
Note these Carnegie stages are only approximate day timings for average of embryos. Links: Carnegie Stage Comparison
Table References   Human O'Rahilly R. (1979). Early human development and the chief sources of information on staged human embryos. Eur. J. Obstet. Gynecol. Reprod. Biol. , 9, 273-80. PMID: 400868 Otis EM and Brent R. Equivalent ages in mouse and human embryos. (1954) Anat Rec. 120(1):33-63. PMID 13207763 Mouse Theiler K. The House Mouse: Atlas of Mouse Development (1972, 1989) Springer-Verlag, NY. Online OTIS EM & BRENT R. (1954). Equivalent ages in mouse and human embryos. Anat. Rec. , 120, 33-63. PMID: 13207763 Rat Witschi E. Rat Development. In: Growth Including Reproduction and Morphological Development. (1962) Altman PL. and Dittmer DS. ed. Fed. Am. Soc. Exp. Biol., Washington DC, pp. 304-314. Pérez-Cano FJ, Franch À, Castellote C & Castell M. (2012). The suckling rat as a model for immunonutrition studies in early life. Clin. Dev. Immunol. , 2012, 537310. PMID: 22899949 DOI.

Model Comparison

Animal Model Comparison

Postnatal Animal Models	mouse	rat	pig
Pregnancy period (days)	18 – 21	21 – 23	110 – 118
Placenta type	Discoidal, decidual hemoendothelial choroidea	Discoidal, decidual hemoendothelial choroidea	Epitheliochorial
Litter size	6 – 12	6 – 15	11 – 16
Birth weight (g)	0.5 – 1.5	3 – 5	900 – 1600
Weaning weight male/female (g)	18 – 25/16 – 25	55 – 90/45 – 80	6000 – 8000
Suckling period (days)	21–28	21	28–49
Solid diet beginning (days)	10	12	12 – 15
Puberty male/female (week)	4 – 6/5	6/6 – 8	20 – 28
Life expectancy (years)	1 - 2	2 - 3	14 – 18
Table data - Otis and Brent (1954)   Links: timeline

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Cite this page: Hill, M.A. (2024, April 26) Embryology Timeline Comparisons. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Timeline_Comparisons

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G