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The root term [-auricul-] arises from the Latin word [Auricula], which is a diminutive of [auris] meaning "ear". Auricula means "a little ear".
The adjectival form [auricular] is used in several places in human anatomy. One of them is the [auricular surface of the iliac bone] (see image) referring to a roughened area in the medial aspect of the iliac bone where it articulates with the sacrum, forming the sacroiliac joint. The Latin term for this articular surface is facies auricularis ossis ilii. A corresponding auricular surface is found in the sacral bone, the facies auricularis ossis sacri.
[Auricular] is also used in the term [auricular cartilage], referring to the fibrocartilage found in the ear or [pinna].
A shortened version is the root term [-aur(i)-], meaning the same. It is used in the word [auricle] referring to the atrial appendages of the heart. These appendages when seen from the outside of the heart really look like little "boxer's ears". This image (click here) shows the left atrial appendage (LAA) or left auricle.
By the way, did you know that one of the digits was called "digitus auricularis"? Read the story here.
Image property of: CAA.Inc.Photographer: David M. Klein