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There are three kinds of exciting influences: those acting on the sensory apparatus of the vestibular nerves, those acting on the skin, and those acting on the deep parts, such as the muscles and joints.
The useless relic of it passes through the wall of the petrous bone in the shape of a narrow canal, and is called the vestibular aqueduct. It is only the inner and lower bulbous part of the separated auscultory vesicle that develops into the highly complex and differentiated structure that is afterwards known as the secondary labyrinth.
Through the cochlear nerves we learn the height and timbre, through the vestibular nerves the intensity, of tones. The first structure of this highly elaborate organ is very simple in the embryo of man and all the other Craniotes; it is a pit-like depression in the skin. This sinks into a sort of pit, and severs from the epidermis, just as the lens of the eye does.
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