a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a composite sensory nerve supplying the hair cells of the vestibular organ and the hair cells of the cochlea