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Year : 2011  |  Volume : 17  |  Issue : 3  |  Page : 117-119

Anatomical landmarks: A surgical aid for identification of facial nerve to the internal acoustic meatus

Department of Anatomy, Goa Medical College, Bambolim, Goa, India

Correspondence Address:
Prashant E Natekar
Department of Anatomy, Goa Medical College, Bambolim 403 202, Goa
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0971-7749.91192

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Introduction : Identification of the facial nerve is very essential as injury to facial nerve is a dreadful complication of ear surgery and its outcome can be most devastating to the patient as well as the surgeon. Surgical intervention in acoustic neurinomas, cholesteotomas, preservation of cochlear nerve and inner ear is an ardous task and requires dedication to prevent an unfortunate disaster. Any damage to vestibule, labyrinth or cochlear can cause leakage of endolymph leading to deafness if tumors of the cochlear nerve are dissected in an a traumatic way. The location of the internal acoustic meatus and identifi cation and location of its anatomical landmarks minimizes the chance of injury to the facial nerve and provides an insight for the surgeons to rationalize the surgical approach in ear surgery. Materials and Methods : The study is carried out on 100 temporal bones (dried and cadaveric) by examining the foramen of internal acoustic meatus of the right and the left sides of both the sexes. Each foramen was carefully examined and its relation to the important anatomical landmarks was measured in millimeters on both the sides. Results : The average distance from IAM to superior petrosal sinus was 4.5 mm, IAM to sigmoid sinus was 24.08 mm, IAM to aqueduct of vestibule was 10.47 mm and IAM to jugular foramen was 8.6 mm. Conclusions: The present study evaluates the distance in millimeters between the IAM to superior petrosal sinus, sigmoid sinus, aqueduct of vestibule and jugular foramen. thorough knowledge of the distance between the IAM to important anatomical landmarks is basic and very important to the surgeons and radiologists before and during surgical intervention.

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