Cell and Tissue Research

, Volume 200, Issue 1, pp 153–157 | Cite as

Light- and electron-microscopic structure of cells protruding into the mesencephalic ventricle of Scyllium stellare (Elasmobranchii, Selachii)

  • Milena Kemali
  • Antonio Miralto
Short Communication


In the elasmobranch fish, Scyllium stellare, a complex group of cells protrudes into the cavity of the mesencephalic ventricle of the optic tectum. It consists of six to seven large spherical perikarya which resemble neurons of the mesencephalic nucleus of the Vth cranial nerve. The bundled processes of these cells form a stalk connecting the protrusion with the brain tissue. The protrusion is located in the region where the mesencephalic ventricle joins the cerebral aqueduct. This complex was not found in all specimens examined in the present study. The functional role of this peculiar group of cells, which contain dense core granules and are bathed in the cerebrospinal fluid, is open to discussion.

Key words

Ventricular protrusion Clustered perikarya Mesencephalic ventricle (optic tectum) Light and electron microscopy Scyllium stellare (Elasmobranchii, Selachii) 


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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Milena Kemali
    • 1
  • Antonio Miralto
    • 1
  1. 1.Arco Felice (Naples) and Stazione ZoologicaLaboratorio di Cibernetica del CNRNaplesItaly

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