Between two cavities.
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in·ter·cav·ern·ous .int-ər-'kav-ər-nəs adj situated between and connecting the cavernous sinuses behind and in front of the pituitary gland <an \intercavernous sinus>
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in·ter·cav·er·nous (in″tər-kavґər-nəs) between two cavities.Medical dictionary. 2011.