Intranasal (IN)

1-Restrain the animal as described above.

2-Using a syringe or pipettor, place a small amount of the material to be inhaled at the nares of the animal.

3-Watch for the material to disappear into the nares.

4-Repeat as necessary until the desired volume has been administered.

http://www.jove.com/video/2771/manual-restraint-common-compound-administration-routes-mice