Mesio Buccal second canal in maxillary first molar : Case courtesy by: Dr. Sachin khattar
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  The pulp chamber of the maxillary molars is generally located in the mesial two-thirds of the crown. The orifice of the main MB canal is located slightly palatal to the MB cusp tip. the orifice of the palatal canal is found central-palatally in the mesial two thirds of the crown. When a second MB canal is present, its orifice will be seen near the main MB canal on a straight line between this canal and palatal canal.

The distobuccal canal is located slightly distally to the midline between The mesial and distal surfaces of the crown and somewhat more paltally Than the MB canal.
 
           
   
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