Furthermore,

there is a portion of the head, whereby an animal
hears, a part incapable of breathing, the 'ear'. I say 'incapable of
breathing', for Alcmaeon is mistaken when he says that goats inspire
through their ears. Of the ear one part is unnamed, the other part
is called the 'lobe'; and it is entirely composed of gristle and
flesh. The ear is constructed internally like the trumpet-shell, and
the innermost bone is like the ear itself, and into it at the end
the sound makes its way, as into the bottom of a jar. This
receptacle does not communicate by any passage with the brain, but
does so with the palate, and a vein extends from the brain towards it.