Take a look at these articles. These might help you.
1. Southam DS, Dolovich M, O'Byrne PM, Inman MD. Distribution of intranasal instillations in mice: effects of volume, time, body position, and anesthesia. Am J Physiol Lung Cell Mol Physiol. 2002 Apr;282(4):L833-9. PubMed PMID: 11880310.