106 SENSE ORGANS. 



Find the ampullary expansion of the semi-circular canal, and 

 recognise that it is lined with flat epithelium, lying close to 

 the osseous walls. On the outer wall will be found the crysta 

 acoustica in T.S. On the latter the lining epithelium forms 

 a cluster of larger cells, from which project hair-like processes 

 into the cavity of the tube. Note that the crysta is arranged 

 with its length across the axis of the tube. 



