【上位】 an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall" 物の内部または間の空間あるいは隙間。
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【下位】 the small opening (on both the right and left sides) that connects the third ventricle in the diencephalon with the lateral ventricle in the cerebral hemisphere 間脳にある第三脳室と大脳半球にある側脳室を結びつける（右側と左側の両方の）小さな開口部。
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