. Biological structure and function; proceedings. Biochemistry; Cytology. Fig. 2. Cross-section through four squid sperm tails (/). The left tail is sec- tioned close to the centriole and is partly surrounded by the nucleus («). In this flagellum and in the one to the right a proper orientation of the section has allowed a detailed study of the flagellar filaments. The nine outer filaments are connected to nine electron-dense accessory filaments that form a circle outside the proper flagellar filaments. The nine flagellar filaments are themselves double, in that they can be said to consist of
. Biological structure and function; proceedings. Biochemistry; Cytology. Fig. 2. Cross-section through four squid sperm tails (/). The left tail is sec- tioned close to the centriole and is partly surrounded by the nucleus («). In this flagellum and in the one to the right a proper orientation of the section has allowed a detailed study of the flagellar filaments. The nine outer filaments are connected to nine electron-dense accessory filaments that form a circle outside the proper flagellar filaments. The nine flagellar filaments are themselves double, in that they can be said to consist of two subunits, one having a light and the other a dark appearance. Magnification 81 250 x . flagellum works with a regular flagellar beat when the collar is expanded but with a beat similar to that of cilia when the collar is retracted. P'igure 3 shows at low magnification a section through a chamber lined with collar cells. The marked area in this picture is further enlarged and is shown in Fig. 4. Two notable features characterize this flagellum with regard to its fine structure: (i) There is a marked difference in size between the two subunits of each of the nine peripheral filaments. The larger subunit is that which is provided with arms; a reverse proportion has been found in some multiflagellated protozoa [7]. (2) There are thin indistinct hairs lining two sides of the flagellum (marked h). These hairs are roughly in a line parallel to the two central filaments. The appearance is similar to that. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original IUB/IUBS International Symposium (1st : 1960 : Stockholm); International Union of Biochemistry; International Union of Biological Sciences; Goodwin, T. W. (Trevor Walworth); Lindberg, Olov, 1914-. London, New York, Academic Press
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