Table 2. Laminar and entire wall thickness (mean ± SD in µm) of the tenial and haustral part of P1.

Layer	Tenial part	Haustral part
Mucosa	401.8 ± 51.9	410.6 ± 67.7
Lamina muscularis mucosae	11.7 ± 6.1	11.3 ± 6.2
Submucosa	39.5 ± 21.9	29.5 ± 11.2
Tunica muscularis, inner circular	143.9 ± 22.9	120.3 ± 31.9
Tunica muscularis, outer longitudinal	152.3 ± 22.9	14.2 ± 4.3
Serosa	16.0 ± 4.2	19.9 ± 9.8
Total	765.1 ± 92.2	596.1 ± 67.7

n=18 for each value except for the outer longitudinal layer of the tunica muscularis of the haustral part, where n=6. This is due to the occasional absence of the longitudinal muscles.