ISSN:
1432-0886
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Abstract A correlated light and electron microscopical study has been made on the sex vesicle of human spermatocytes. The human sex vesicle contains no RNA and no ultrastructural granular element. The sex vesicle is formed at zygotene by the two heteropycnotic sex chromosomes that come into end-to-end contact at this stage. Neither the main nor secondary nucleoli are formed in connection with the human sex vesicle. The ultrastructure of the sex vesicle shows two main components: chromatin threads 250 of Å in diameter, separated by interthread spaces, and the filament or core, 700 Å wide and smoothly curved. No synaptinemal complexes have been observed in the human sex vesicle, although the filaments can become parallel for short segments. The absence of synaptinemal complexes is discussed in relation to the observations on other mammals.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00291284
Permalink