ZOO 102

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    • Hagfishes in the genus Myxine have five or six pairs of well-vascularized gill pouches, rarely seven, associated with the pharynx
    • Afferent branchial ducts conduct respiratory water from the pharynx to the pouches
    • efferent ducts lead from the pouches to the exterior.
    • In hagfishes respiratory water enters the median naris and passes via a nasopharyngeal duct to a velar chamber at the anterior end of the pharynx
    • The pharyngocutaneous duct appears to be a
      modified last gill pouch.
    • Periodically, debris or particles too large to enter the afferent branchial ducts are forcefully ejected through the pharyngocutaneous duct in a manner some what analogous to coughing.
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