Fig. 6
From: The growth pattern of the human intestine and its mesentery
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)