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Chondrodermatitis nodularis chronica helicis (CNCH) is a small, nodular, tender, chronic inflammatory lesion occurring on the helix of the ear, most often in men. [2]: 610 it often presents as a benign painful erythematous nodule fixed to the cartilage of the helix or antihelix of the external ear. [3]
These hillocks develop into the folds of the auricle and gradually shift upwards and backwards to their final position on the head. En route accessory auricles (also known as preauricular tags) may be left behind. The first three hillocks are derived from the 1st branchial arch and form the tragus, crus of the helix, and helix, respectively.
The eardrum is made up of three layers (ectoderm, endoderm and connective tissue). The auricle originates as a fusion of six hillocks. The first three hillocks are derived from the lower part of the first pharyngeal arch and form the tragus, crus of the helix, and helix, respectively.
The helicis major is a narrow vertical band situated upon the anterior margin of the helix. It arises below, from the spina helicis, and is inserted into the anterior border of the helix, just where it is about to curve backward. The helicis minor is an oblique fasciculus, covering the crus helicis.
Based on the kind of antihelix deformity and the condition of the intrinsic auricular muscle, there are two types of cryptotia.Type I cryptotia is characterized by compression of the antihelix's body and superior crus, burying the upper portion beneath the skin.
The Helicis minor (musculus helicis minor or smaller muscle of helix) is a small skeletal muscle.The helicis minor is an intrinsic muscle of the outer ear.The muscle runs obliques and covers the helical crus, part of the helix located just above the tragus.
The helix is the prominent rim of the auricle. Where the helix turns downwards posteriorly, a small tubercle is sometimes seen, namely the auricular tubercle of Darwin.
The antihelix (anthelix) is a part of the visible ear; the pinna.The antihelix is a curved prominence of cartilage parallel with and in front of the helix on the pinna.. The antihelix divides above into two legs or crura; the crura antihelicis, between which is a triangular depression, the fossa triangularis.