Table 1.

Thickness of the two mucus layers in vivo in the rat gastrointestinal tract^a

Mucus layer	Mean mucus thickness ± SE, μm
	Stomach		Small intestine			Colon
	Corpus	Antrum	Duodenum	Jejunum	Ileum	1–2 cm distal to cecum
Loosely adherent mucus layer	109 ± 12	120 ± 38	154 ± 39	108 ± 5	447 ± 47	714 ± 109
Firmly adherent mucus layer	80 ± 5	154 ± 16	16 ± 3	15 ± 2	29 ± 8	116 ± 51
Total mucus layer	189 ± 11	274 ± 41	170 ± 38	123 ± 4	476 ± 47	830 ± 110

^a N = 6–11 animals per determination.

SE—standard error.

(Data from Atuma et al. [36].)