The Anatomy of the Ear

The external ear is also called the auricula or pinna. The outer rim or helix spirals up out of the bowl-like conchal fossa. A swelling known as Darwin’s tubercle is present in 10.4% of the population.

The antihelix curves inside the helix, separated by the groove called the scapha. It splits at the top into the superior and inferior crux or leg, with the triangular fossa in between.

The flap called the tragus protects of the auditory meatus, or earhole. Often with two distinct swellings, it uses the Greek name for goat because of its beard-like hairs.

Across the intertragical notch is the prominence known as the antitragus, part of the stiff cartilaginous shelf from which hangs the fleshy auricular lobule (earlobe). The depression behind the ear is called the auricular sulcus.

Wikipedia on external ear,
Darwin's tubercle (thanks, Donna)
tragus (thanks, Stape)