Incisura terminalis is between
There is no cartilage between tragus and crus of the helix and an incision made in this area will not cut through the cartilage and is used for the endaural approach in surgery of external auditory canal and mastoid.
Tragus and crux of helix
Ear lobule and antihelix
Antihelix and external auditory meatus
Tragus and ear lobule