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Longitudinal section through the duodenum of a rat
Legend:
1 smooth muscle
2 villi with resorptive epithelium (mucosa)
3 submucosa
4 lumen (+ food particles)
5 crypts
English name: Rat
Scientific name: Rattus rattus
Familia: Muridae
Classis: Mammalia
Phylum: Chordata (subphylum vertebrata)
Regnum: Animalia
ad 5. Crypts of Leiberkuhn with germination layers of epithelium
