Helix: The prominent rim of the auricle. A transverse ridge of helix extending into the ear cavity is called "helix crus"; a small tubercle at the posterior-inferior side of the helix is called "helix tubercle"; the junction of the inferior part of the helix and the lobule is called "helix cauda".
Antihelix: An elevated ridge anterior and parallel to the helix at the medial side of the helix, also called "the principal part of antihelix". The superior branch of the bifurcation of the antihelix is called "superior antihelix crus", and the inferior branch is called "inferior antihelix crus".
Triangular fossa: The triangular depression between the two crura of the antihelix.
Tragus: A curved flap in front of the auricle. 
Scapha: The curved depression between the helix and antihelix.
Supratragic notch: The depression between the helix crus and the upper border of the tragus.
Antitragus: A small tubercle opposite to the tragus and inferior to the ear lobe.
Intertragic notch: The depression between the tragus and the antitragus.
Helix notch: The mild depression between the antitragus and antihelix.
Ear lobe: The lowest part of the auricle where there is no cartilage.
Cymba concha: The cavum superior to the helix crus.
Cavum concha: The cavum inferior to the helix crus.
Orifice of the external auditory meatus: The orifice anterior to the cavum concha.