Two hyena retinas
Date
ca.1901
Creator
A. W. Head (British) , Draughtsman
Object type
Archive reference number
Material
Dimensions
height (card support): 185mm
width (card support): 220mm
width (card support): 220mm
Subject
Content object
Description
Anatomical study of two retinas as seen through an ophthalmoscope. The retinas belong to two eutherian mammals from the Hyaenidae family, a striped hyena Hyaena hyaena [listed here as Hyaena stiata] and a spotted hyena Crocuta crocuta [listed here as Hyaena crocuta].
The fundi [internal surfaces] are divided into three zones: a peripheral zone of violet, an intermediate zone of green and a central zone of yellow. Both are covered with minute dots, and both discs are round and brown. The retinal vessels tend in all directions.
George Lindsay Johnson described the pupils of these mammals as follows: ‘vertically oval when the animal is at rest. As soon as it is disturbed by any noise or in any other way, the pupils instantaneously dilate to a complete circle as if the animal had its iris under control.’
Created for inclusion in George Lindsay Johnson's paper ‘Contributions to the comparative anatomy of the mammalian eye, chiefly based on ophthalmoscopic examination’ published in the Philosophical Transactions of the Royal Society B, Volume 194 (1901). Only one is incorporated as a plate in the final publication, the retina of the striped hyena, plate eight, p.92.
George Lindsay Johnson (1853-1943) British ophthalmologist carried out extensive research in optics, and is best known for his work on mammalian eyes. He was not a Fellow of the Royal Society.
The fundi [internal surfaces] are divided into three zones: a peripheral zone of violet, an intermediate zone of green and a central zone of yellow. Both are covered with minute dots, and both discs are round and brown. The retinal vessels tend in all directions.
George Lindsay Johnson described the pupils of these mammals as follows: ‘vertically oval when the animal is at rest. As soon as it is disturbed by any noise or in any other way, the pupils instantaneously dilate to a complete circle as if the animal had its iris under control.’
Created for inclusion in George Lindsay Johnson's paper ‘Contributions to the comparative anatomy of the mammalian eye, chiefly based on ophthalmoscopic examination’ published in the Philosophical Transactions of the Royal Society B, Volume 194 (1901). Only one is incorporated as a plate in the final publication, the retina of the striped hyena, plate eight, p.92.
George Lindsay Johnson (1853-1943) British ophthalmologist carried out extensive research in optics, and is best known for his work on mammalian eyes. He was not a Fellow of the Royal Society.
Related fellows
George Lindsay Johnson (1853 - 1943, British) , Ophthalmologist
Associated place