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Digestive system (apparatus digestorius) 225

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10.64 Jejunum at the level of Meckel’s diverticulum. 10.65 Ileum with villi (chicken). Haematoxylin and
Haematoxylin and eosin stain (x10). eosin stain (x40).

Intestinal villi in
small intestine
with simple
columnar
epithelium

Lamina propria
mucosae and
mucosal folds

10.66 Caecum with intestinal villi (chicken). Haematoxylin 10.67 Cloaca (coprodeum) with intestinal villi (chicken).
and eosin stain (x25). Haematoxylin and eosin stain (x42).

Cloaca ible boundary. The intestinal villi are particularly broad in
The common excretory passage for the avian digestive and this region. Distally the villi become shorter. The dorsal
urogenital systems, the cloaca, is divided by two mucosal wall of the subsequent segment, the urodeum, contains
folds into three sections: the ostia of the paired ureters. Adjacent to these openings,
the deferent ducts of male birds open on conical papillae.
· coprodeum, In females, the left side of the urodeum receives the left
· urodeum and oviduct. In the final section, the proctodeum, the rectal
· proctodeum. lining transitions to a non-glandular mucosa that is con-
tinuous with the external skin. The opening of the cloacal
In the chicken, the rectum merges with the first segment bursa (bursa cloacalis, bursa of Fabricius) is in the dorsal
of the cloaca, the coprodeum (Figure 10.67) with no vis- wall of the proctodeum (see Chapter 8, ‘Immune system

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