Letter | Published:

Barium Content of Different Parts of the Choroid of the Bovine Eye

Nature volume 199, page 1007 (07 September 1963) | Download Citation

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Abstract

Sowden and Pirie1 analysed the barium and strontium content of different parts of the eye and confirmed earlier work showing that cattle choroid contained large amounts of barium. These authors did not, however, separate the tapetal fibres from the pigmented choroid and determine whether barium was also present in the tapetum. Weitzel et al.2 have shown that zinc is an integral part of the tapetum of carnivores, and although the structure of the tapetum of the cow is quite different from that in carnivores we thought it would be interesting to determine whether there was any particular concentration of barium in the tapetum of the cow. This is a specialized part of the central choroid lying immediately under the retina and made up of fine parallel fibres which act as a diffraction grating and reflect light3. It is backed by pigmented choroidal tissue.

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Author information

Author notes

    • KIRSTE KOSTIAL-SIMONOVIC

    Present address: Institute for Medical Research, Zagreb.

Affiliations

  1. Medical Research Council Radiobiological Research Unit, Harwell.

    • KIRSTE KOSTIAL-SIMONOVIC
  2. Nuffield Laboratory of Ophthalmology, University of Oxford.

    • ANTOINETTE PIRIE

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DOI

https://doi.org/10.1038/1991007a0

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