Digestive System Of Amphioxus
Digestive system – It includes alimentary canal and digestive gland. Alimentary canal – a) Mouth –*It is a large median aperture located at the base of vestibule. *Mouth is surrounded by velum, which work as valve and filter. *Velum is supported by velar ring and bears tentacles that prevent undesirable objects from entering the digestive cavity. …show more content…
*The gill slits are without gills and their number increases with age. *The space between two gill slits is called gill lamella. *It is formed by long ciliated cells and is covered by endodermal epithelium. *The cells of outer layer are small and non ciliated which are formed by ectoderm. *There is a gill bar in each lamella, which is of two types – primary and secondary (Fig.4.5 and 4.6A and B). *The gill bars are connected dorsally by loops. …show more content…
*It secretes digestive enzymes such as proteases and lipase, as well as stores fat. *It is present on the anterior broad part of the intestine. *It is lined by glandular epithelium and is surrounded by narrow coelomic
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