Wednesday 29 February 2012

BRANCHIOSTOMA-APERTURES

The trunk bears three openings mouth ,atriopore and anus.The oral hood formed by dorsal and lateral projections of the body. Mouth is formed by margin by oral hood. Atriopore is a small ventral aperture just in front  of the ventral fin. The large atrial cavity surrounding the pharynx opens to outside through atriopore.The anus lies asymmetrically to the left of mid-ventral line at the base of caudal fin. The small posterior body region the anus is the tail.

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