Nasal Cavity | National Institute of Environmental Health Sciences Skip Navigation Nasal Cavity Close the left navigation Much of the work carried out by DTT is in support of the National Toxicology Program (NTP), an interagency partnership of the Food and Drug Administration, National Institute for Occupational Safety and Health, and NIEHS. Visit the NTP Website Revised Guides for Organ Sampling and Trimming in Rats and Mice Nasal Cavity Sections Nasal Turbinates Trimming Examples L1 Anterior Nasal Cavity Section L1 Posterior Nasal Cavity Section L2 Anterior Nasal Cavity Section L2 Posterior Nasal Cavity Section L3 Anterior Nasal Cavity Section L3 Posterior Nasal Cavity Section Back to Top Last Reviewed: February 04, 2026