The oblique muscle of the auricle is a few short fibres on the back surface of the ear, running upward from the concha to the bulge produced by the triangular fossa. Together with the transverse muscle it makes up the intrinsic muscles of the cranial surface of the auricle. It is very small and often hard to identify, even in dissection.
| Origin | Upper and back part of the eminence of the concha on the cranial surface of the auricle |
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| Insertion | Eminence of the triangular fossa on the cranial surface of the auricle, just above |
| Nerve Supply | Posterior auricular nerve (facial nerve, CN VII) |
| Blood Supply | Posterior auricular artery |
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It is rudimentary in humans, with at most a minor effect on the shape of the upper ear.
Its importance lies mostly in describing the complete anatomy of the auricle and in otoplasty, where the back of the conchal and triangular fossa cartilage is exposed and the muscle fibres are divided. Like the other intrinsic ear muscles it is innervated by the facial nerve and loses function silently in facial palsy. Injury to the back of the ear from surgery or trauma heals well because of the rich supply from the posterior auricular artery.
Not palpable; it lies deep to the skin on the back of the upper auricle.
A collection of blood beneath the perichondrium of the ear cartilage after blunt injury; prompt drainage and pressure dressing prevent permanent cauliflower ear deformity.
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