The up arrow that follows each description will take you back to the top of the figure. Enjoy your tour. Comprising the pinna , ear cana l, and outer layer of the eardrum .
Sound enters the earcanal.
The pinna is composed of cartilage and has a relatively poor blood supply. It presence on both sides of the head allows us to localize the source of sound from the front vs the back. And, of course, the lobe of the pinna is handy for single or multiple hoops, loops, diamonds, etc. The ceruminous and sebacious glands in the cartilaginous portion of the ear canal combine to produce cerumen. See the link, Earwax for further discussion of this substance.