Unformatted text preview: the other. This is the supporting notochord . Immediately dorsal to the notochord is the hollow, dorsal nerve cord. Examine a cross section of Amphioxis made in the region of the pharynx, and correlate it with the anatomy you observed in the whole mount. Water enters the mouth, moves into the pharynx, and exits through the gill slits. As it moves across the gill slits, food is trapped and gases are exchanged. The food particles then enter the intestine and water exits through the atriopore (not visible in cross section). Ventro-lateral gonads may or may not be visible in your section. Label the diagram. Which chordate character is missing? Figure 2. Amphioxis cross section (Subphylum Cephalochordata)....
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- Fall '11
- Biology, Dorsal nerve cord, gill slits, Subphylum Cephalochordata, Lancelet, Cephalochordata