Type of Article:  Original Research

Volume 5; Issue 4.3 (December 2017)

Page No.: 4660-4673

DOI: https://dx.doi.org/10.16965/ijar.2017.430


Irungbam Deven Singh *1, Ch. Rajlakshmi 2.

*1,2Associate Professor, Department of Anatomy, Regional Institute of Medical Sciences, Imphal, Manipur, India.

Address for correspondence: Dr. Irungbam Deven Singh, Associate Professor, Department of Anatomy, Regional Institute of Medical Sciences, Imphal, Manipur, India. E-mail : irungdesi@gmail.com.


Introduction: The temporal bone lies on the lateral side of the skull. It houses most parts of the ear. The petrous is a wedge-shaped part of temporal bone that houses the ear. The ear is the organ of hearing and balance. It has three parts—external, middle and internal. Sectional anatomy allows the study of the relation between anatomic structures.

Materials and Methods: Seven left petrous bones separated from cadaveric temporal bones were used for the study. About 2mm thick sections were cut in three axes—longitudinal, transverse and horizontal. They were studied with the naked eye or by using a hand lens.

Results: In the longitudinal sections, the earlier sections showed internal acoustic meatus. Later sections show cochlea, vestibule and middle ear structures and the external acoustic meatus. In the transverse sections, earlier sections showed structures related to anterior wall of middle ear. Near the middle, cochlea could be visualized. Further posterior sections showed middle ear, vestibule and semicircular canal. Then, the mastoid antrum and air cells were seen. In the horizontal sections, the middle ear and mastoid antrum were opened from above. Lower sections showed middle ear structures, vestibule, semicircular canals and cochlea were seen.

Conclusion: Structure of the ear is complex. Students find it difficult to understand because of the miniature component structures and also their deep location inside the petrous. Sectional anatomy not only shows the relations between structures but also a vivid picture of many of these structures.

KEY WORDS: Ear, Temporal bone, Petrous, Sectional anatomy.


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Cite this article: Irungbam Deven Singh, Ch. Rajlakshmi. SECTIONAL ANATOMY OF THE PETROUS BONE FOR THE STUDY OF THE EAR. Int J Anat Res 2017;5(4.3):4660-4673. DOI: 10.16965/ijar.2017.430