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Anatomy of the Ear

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...

The Auditory Ossicles

The Auditory Ossicles

The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...

The Cochlea

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

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Surgical Treatment of an Endolymphatic Sac Tumor

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[Middle ear adenoma].

Edwin Abraham Medina¹, Viviana Leticia Arias

¹Departamento de Patología, Universidad Nacional de Colombia, Bogotá, D.C., Colombia. eamediname@unal.edu.co <eamediname@unal.edu.co>

Biomedica : Revista Del Instituto Nacional De Salud

|May 4, 2010

Summary

Middle ear adenomas are rare benign epithelial tumors. Histochemistry and immunohistochemistry aided diagnosis of a case presenting in the external ear canal, with proposed criteria for future cases.

Area of Science:

Otolaryngology
Pathology
Neoplastic disease

Background:

Middle ear neoplasms are rare and challenging to diagnose.
Limited biological data and lack of standardized diagnostic criteria contribute to diagnostic difficulties.

Observation:

A middle ear neoplasm presented as a growth protruding from the middle ear into the external ear canal via the eardrum.
The lesion was resected and identified as a benign epithelial tumor.

Findings:

Histochemistry and immunohistochemistry analyses were crucial for diagnosis due to insufficient clinical information.
The final diagnosis was middle ear adenoma.

Implications:

This case highlights the diagnostic challenges of rare middle ear neoplasms.

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Proposed diagnostic criteria aim to improve the identification and management of these tumors.