Invertebrate Models (Click on image to enlarge)

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1  Earthworm model
2  Earthworm model: anterior end with brain, mouth, pharynx, esophagus, and hearts
3  Earthworm model: anterior end with esophagus, crop, seminal vesicles, and hearts
4  Earthworm model: anterior end with crop, gizzard, and intestine
5  Earthworm model: cross section through intestine showing typhlosole
6  Clam model
7  Crayfish model
8  Crayfish model: cross section
9  Amphioxus (Branchiostoma) model
10 Amphioxus (Branchiostoma) model: anterior end
11 Amphioxus (Branchiostoma) model: middle section
12 Amphioxus (Branchiostoma) model: posterior end
13 Amphioxus (Branchiostoma) model: cross section through the buccal region
14  Amphioxus (Branchiostoma) model: cross section through the anterior pharyngeal region
15  Amphioxus (Branchiostoma) model: cross section through the posterior pharyngeal region
16  Amphioxus (Branchiostoma) model: cross section through the posterior intestinal region