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| a hollow space within the body, an organ or a bone |
| the system by which oxygen is taken into the body; in mammals the system includes the nasal passages, pharynx, trachea, bronchi, and lungs |
endocranium en·do·cra·ni·um (ěn'dō-krā'nē-əm)
n. pl. en·do·cra·ni·a (-nē-ə)
The outermost layer of the dura mater.
The inner surface of the skull.