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Elemental composition of the developing inner ear

M Anniko, R Wroblewski

    The Annals of Otology, Rhinology, and Laryngology
    |January 1, 1981
    PubMed
    Summary
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    Potassium levels in the inner ear fluid of CBA mice mature rapidly after birth. By eight days after birth, the endolymph reaches its mature elemental composition.

    Area of Science:

    • Otolaryngology
    • Developmental Biology
    • Biochemistry

    Background:

    • The elemental composition of inner ear fluids is crucial for auditory and vestibular function.
    • Understanding the maturation process of endolymph is key to identifying potential developmental disorders.

    Purpose of the Study:

    • To analyze the elemental composition of inner ear fluid-filled compartments in CBA mice during development.
    • To specifically investigate the maturation process of endolymph, focusing on potassium concentration.

    Main Methods:

    • X-ray energy dispersive technique was employed to analyze elemental composition.
    • CBA mice were studied from before birth up to eight days after birth (DAB).

    Main Results:

    Related Experiment Videos

  • Initially, potassium (RK) levels were slightly higher in vestibular endolymph compared to cochlear endolymph.
  • A rapid increase in RK was observed from the fourth DAB, with highest concentrations in the basal cochlea and vestibular endolymph.
  • Differences in RK diminished by the sixth DAB, and mature endolymph composition was achieved by the eighth DAB.

    • Conclusions:

    • Endolymph elemental composition, particularly potassium, undergoes significant maturation in the early postnatal period.
    • A mature endolymph composition is established by the eighth day after birth in CBA mice.
    • The employed technique has limitations in detecting minimal shifts in elemental composition between cochlear and vestibular endolymph.