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Related Experiment Videos

The human external auditory canal, secretory system--an ultrastructural study

T Main, D Lim

    The Laryngoscope
    |August 1, 1976
    PubMed
    Summary

    This study reveals two secretory gland types in the human ear canal: modified apocrine and sebaceous. The modified apocrine glands exhibit both apocrine and eccrine secretion modes, contributing to ear canal defense.

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    Anatomic considerations for immediate implant placement in the mandibular molar region: a cross-sectional study using cone-beam computed tomography.

    Folia morphologica·2021

    Area of Science:

    • Otolaryngology
    • Dermatology
    • Cell Biology

    Background:

    • The human external auditory canal's skin harbors a complex secretory system.
    • Understanding these glands is crucial for ear health and immune function.

    Purpose of the Study:

    • To investigate the secretory system of the human external auditory canal skin.
    • To characterize the morphology and secretory mechanisms of ear canal glands.

    Main Methods:

    • Light microscopy
    • Transmission electron microscopy
    • Scanning electron microscopy

    Main Results:

    • Identified two secretory gland types: modified apocrine (ceruminous) and sebaceous glands.
    • Sebaceous glands showed homogeneous secretory cells.
    • Modified apocrine glands displayed heterogeneous secretory granules (dark and light) and evidence of both apocrine and eccrine secretion.

    Conclusions:

    • The external auditory canal possesses a dual secretory gland system with distinct cellular morphologies.
    • Modified apocrine glands demonstrate a mixed secretion mode, reconciling previous conflicting microscopic observations.
    • Ear canal secretions likely play a role in local immune defense.

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