The relations of the parts are shown more accurately than is possible in any diagram.

It will be noticed that the vibrations from the larynx would pass directly behind the soft palate into the nasal chamber, and very directly into the mouth.

The nasal roof is formed by two bones situated between the eyes; the sphenoid or wedge-bone, which is connected with all other bones of the head, and the ethmoid or sieve-like bone.

The structure of these two bones, especially of the ethmoid, consists of very thin plates or laminae, forming a mass of air cavities which communicate by small openings with the nasal cavity below.

Thus, the vibrations in the nose are transmitted to the air spaces above, and the effective qualities of the head vibrations are added to the tone.
THE LARYNX The larynx or voice-box contains the vocal cords.