part_of
part of
part of
bone element
anatomical conduit
bone foramen
http://upload.wikimedia.org/wikipedia/commons/8/81/Gray193.png
in FMA and ZFA this is a conduit space, not a conduit. Note there may be some additional disambiguation required: foramen is used loosely in the sense of any opening (e.g. foramen primum). FMA appears to use cranial conduit (undefined) in the sense of any foramen of the skull (includes mental foramen, which is not in the cranium proper).
foramen
uberon
VHOG:0001760
UBERON:0005744
Anatomical space that is an opening in a bone, usually for passage of blood vessels or nerves.
TAO:0001736
AAO:0010438
ZFA:0005386