Brain, Vol. 46, No. 1, 38-48, 1923
© 1923 Oxford University Press
research-article |
THE OCULOMOTOR NUCLEUS OF TARSIUS AND NYCTICEBUS
Department of Anatomy, University College, University of London
The oculomotor nuclei of Tarsius spectrum and Nycticebus tardigradus exhibit the presence of a central nucleus of Perlia which is. smaller than in the anthropoidea. The presence of this nucleus in these forms accords with the conclusion of Brouwer that the median large-celled nucleus appears phylogentically when the recession of the face allows the approximation and consequent convergence of the eyes. The Edinger-Westphal nucleus is in each case a single nucleus lying dorsal to the large-celled groups in the median plane and extending laterally from it. In the anthropoidea this nucleus is bilateral (Brouwer), and following Bernheimer's theory as to the function of these cells, it is suggested that the power of independently focusing an object on corresponding points of the retinæ, although the object is not equidistant from the two eyes, is to be associated with this bilateral arrangement. The evidence to show that a macula lutea is absent in tarsius is set forth (Elliot Smith, Le Gros Clark, Woollard), and it is also concluded that relatively few optic fibres fail to cross in the optic chiasma. These differences from the anthropoidea are believed to indicate the possession by tarsius of a less acute form sense than in higher forms, i.e., stereoscopic vision has not yet been properly attained.
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  W. G. SPILLER UNILATERAL (UNASSOCIATED) INNERVATION OF THE OCULAR MUSCLES Arch Neurol Psychiatry, November 1, 1927; 18(5): 691 - 708. [Abstract] [PDF]
|
|
|
|
|
|
A. J. McLEAN AN ATTEMPT TO IDENTIFY THE CENTRAL CELLS MEDIATING KINESTHETIC SENSE IN THE EXTRINSIC EYE MUSCLES Arch Neurol Psychiatry, March 1, 1927; 17(3): 285 - 302. [Abstract] [PDF]
|
|