How to Cite
Abstract
Ultrastructures spermatozoa taken from the seminiferous tubules of rat testes (Rattus norvegicus) were observed under transmission electron microscopy, u sing the techniques of ultrathin sections, microspeading specimens and replicas. The heads of isolated spermatozoa were of homogeneously high electron density, and had a slightly curved end; in longitudinal sections these zones were composed of a compact homogeneous DNA, covered by a nuclear envelop, cell membrane and small amounts of acrosomal material. The middle piece contained the modified centriols in the junction zone and flagelal microtubules. In transverse sections as well as in replicas, this region consisted of 10 pairs of microtubules and 9 dense fibers surrounded circularly by the mitochondria (mitochondrial sheath).
References
Bedford, J. M. 1966. Development of the fertilizing ability of spermatozoa in the epididymis of the rabbit. Exptl. Zool. 163: 319-329.
Bedford, J. M. 1973. Components of sperm maduration in the human epididymis. Adv. Biosc. 10: 145-155.
Burgos, M. H. & D. Fawcett. 1956. An electron microscope study of spermatid differentiation in the Bufo arenarum. J. Biophys. Biochem Cytol. 2: 223-240.
Bustos-Obregón, E. & J. E. Flechon. 1975. Comparative scanning electron microscope study of boar, bull and ram spermatozoa. Cell. Tiss. Res. 161: 329-341.
Bustos-Obregón. E. 1977. Algunos aspectos morfológicos de la maduración espermática en mamíferos. Rev. Micros. Elec. 4: 97-105.
Fawcett, D. 1956. The anatomy of the mammalian spermatozoon with particular reference to guinea pig. Z. Zellforsch. Mikcrosk op. Anat. 67: 279-296.
Fawcett, D. W. 1975. The mammalian spermatozoon. Developmental Biology 44: 394-436.
Fawcett, D. & R. D. Hollenberg. 1963. Changes in the acrosome of Guinea pig spermatozoa during pasage through the epididymis. Z. Zellforsch 60: 276-292.
Fawcett, D. & S. Ito. 1965. The fine structure of bat spermatozoa. Am. J. Anat. 116: 567-610.
Holstein, A. F. 1977. La diferenciación de las espermátides en el hombre normal y en pacientes infértiles. Rev. Microsc. Elec. 4: 89-95.
Moses, M. J. 1977. Synoptonemal complex kariotiping in spermatocytes of the chinese hamster. Chromosoma (Berl.) 60: 99-125.
Orgebin-Crist, M. C. 1967. Maduration of spermatozoa in the rabbit epididymis: delayed fertilization in does inseminated with epididymal spermatozoa. Ann. Biol, Animale Biochim. Biophys. 7: 373-392.
Orgebin-Crist, M. C. 1969. Studies on the function of epididymis. Biol. Reprod. Suppl. 2: 1-1 3.
Pedersen, H. 1979. Observations on the axial filament complex of the human spermatozoan. J. Ultrastruct. Res. 33: 451-461.
Solari, A. J. 1977. Synoptanemal complex karyotyping in melanoplus differentialis. J. Cell. Sci. 26: 229-250.
Solar i, A. J. 1979. Autosomal Synoptanemal complexex and sexchromosomes without axes in Triatoma infestans (Ruduviidae; Hemiptera). Chromosoma (Berl.) 72: 225-240.
Ureña, F. & Jollyanna Malavasi. 1978. Evolución de la ultraestructura del aparato de Golgi durante la meyosis y la espermiogénesis en el hamster. (Mesocricetus auratus). Rev. Biol. Trop. 26: 371-383.
Comments
This work is licensed under a Creative Commons Attribution 4.0 International License.
Copyright (c) 1987 Revista de Biología Tropical