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In the lobule the air tube divides into a number of smaller tubes, each ending in a thin-walled sac, called an infundibulum. The interior of the infundibulum is separated into many small spaces, known as the alveoli, or air cells. The lungs are remarkable for their lightness and delicacy of structure.
Everything involved in voice production and many things that are not, have been taken up one at a time and made the basis of a method. One builds his reputation on a peculiar way of getting the tone into the frontal sinuses by way of the infundibulum canal, and makes all other things secondary.
On the other hand, the optic thalami, which lie between the latter, belong to the second division, which develops from the "intermediate brain "; to the same section belong the single third cerebral ventricle and the structures that are known as the corpora geniculata, the infundibulum, and the pineal gland.
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