Which preposition to use with septa

of Occurrences 9%

Many wore two red or green or yellow macaw feathers in their hair, and one had a macaw feather stuck transversely through the septum of his nose.

from Occurrences 1%

This form of spine or cupas the case may be, is always distinctly separated by a septum from the cavity of the avicularium itself.

in Occurrences 1%

This contraction of the septa in time gives the whole organ an irregularly puckered appearance, called from this fact a hob-nail liver or, popularly, gin liver.

Which preposition to use with  septa