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Cross-section through the wall of the duodenum of a rat
Legend:
1 longitudinal muscles
2 circular muscles
3 connective tissue
4 mucosa
English name: Black rat
Scientific name: Rattus rattus
Familia: Muridae
Classis: Mammalia
Phylum: Chordata (subphylum vertebrata)
Regnum: Animalia
The alternate wave-like contractions of longitudinal and circular muscles (= peristaltic movement) in the intestine wall are responsible for the flow of food particles in the lumen.
ad 4 Mucosa: crypts of Leiberkuhn with germination epithelium
