Auricle vs pinna
Auricle and pinna refer to the same structure - the visible, external part of the ear that projects from the side of the head. The terms are used interchangeably in anatomy.
- Pinna is the more common lay/clinical term (Latin for "feather" or "wing")
- Auricle is the more formal anatomical term (Latin for "little ear")
- Both describe the cartilaginous, skin-covered flap of the outer ear that collects and funnels sound waves into the external auditory meatus
The only subtle distinction sometimes made: auricle can also refer to the ear-shaped appendages of the heart's atria (the atrial auricles/appendages), so in a cardiology context, "auricle" means something different entirely. In that setting, "pinna" is unambiguous - it always means the external ear.
In summary: For the external ear, auricle = pinna. Just be aware that "auricle" has a second meaning in cardiac anatomy.
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