Nasal septum
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The nasal septum separates the left and right airways of the nasal cavity, dividing the two nostrils.
MRI image showing nasal septum from an axial slice through human head
Nostril
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A nostril is either of the two orifices of the nose. They enable the entry and exit of air and other gasses through the nasal cavities. In birds and mammals, they contain branched bones or cartilages
Nasal septum
…The nasal septum (Latin: septum nasi) separates the left and right airways of the nasal cavity, dividing the two nostrils. It is depressed by the depressor septi nasi muscle…
Human nostrils