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Fetal ear development

The ears begin their development during the fifth week of pregnancy. Ear formation starts from a few small bulges called branchial arches. Portions of the branchial arches form into structures called auricular hillocks. The auricular hillocks grow and join together to form the outer ears.

During the fifth month, the inner and middle parts of the ear develop, but won’t be completely finished until birth.

Physician Reference

International Classification of Diseases, 9th Revision (ICD9)
747 | 754 | 759.9 | 746 | 744 | 745 | 743 | 740 | 741 | 748 | 749 | 757 | 755 | 753 | 759 | 758 | 742 | 756 | 752 | 751 | 750
Current Procedural Terminology (CPT)
70480 | 70481 | 70482 | 00126 | 00124 | 00120 | 69949 | 69636 | 69631 | 69799
Review Date: 9/16/2008
Reviewed By: Dan Sacks MD, FACOG, Obstetrics & Gynecology in Private Practice, West Palm Beach, FL. Review provided by VeriMed Healthcare Network.

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