Behind the last pair of gill-slits the pharynx continues into the short oesophagus.The dorsal and ventral division of pharynx continue for some distance into oesophagus.IN THIS REGION ,THE dorsal part is calles postbranchial canal which posses thick,folded and glandular epithelium.The posterior part of oesophagus reduces in diameter and has deeply furrowed epithelium.
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