File:Small intestine tertiary loops week 8.jpg

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Small intestine tertiary loops week 8

Tertiary loops arise from the 8th week onwards and exhibit variation in number and position. Panels a-d show caudal views of the progressive folding of the apex of the 2nd secondary loop (coded yellow) that results in tertiary loops.

Panel a: CS20 (462); panel b: CS21 (4090); panel c: CS22 (H983); panel d: CS23 (s4141).

The tip of the extending loops remains close to the mesenteric rod. Panels e-g show ventral views of three CS23 embryos of increasing size from left to right (s48, s4141, s9226). Note the variation in number and position of the tertiary loops and the fairly rapid movement of the 2nd secondary loop from right (e) to left (g). For color codes, see Figure Legends.

The scale bars (units in μm) show the diameter of the intestines with their surrounding mesenchyme in that panel. An interactive 3D-PDF is available online (3D-PDF CS23).

Links: secondary loops week 7 to 8 | tertiary loops week 8 | “en-bloc rotation” model | Intestine Development | Week 8




© 2015 Soffers et al. Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.

Fig. 6 Image resized and PMID added.

Cite this page: Hill, M.A. (2024, May 26) Embryology Small intestine tertiary loops week 8.jpg. Retrieved from

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

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