Structure and Function in Cilia and Flagella / Trichocystes, by Peter Satir (auth.), Peter Satir, Raymond Hovasse (eds.)

By Peter Satir (auth.), Peter Satir, Raymond Hovasse (eds.)

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Or that in a structure as small as a cilium it may not be possible to localize ion distribution changes as purely membrane or filament based? b) Fixation of the Metachronal Wave If the membrane has proved recalcitrant to the probes of the physiologist and the model-maker, until recently, the filaments have proved even more so. Even the work of RANDALL et al. (1964) discussed above provides little information Theories ofAxonemal Function 41 on the mechanism of motion. We are just beginning to see the way that the function of the filaments can be attacked.

FP( 2 3 PRIMITIVE ROD SAC TUBULE (I1-CONNECTING II CILIUM 5 6 ALIGNMENT OF ROD SACS 7 Fig. 20. Morphogenesis of vertebrate rod after TOKUYASU and YAMADA (1959). Upon attachment of a centriole to the cell membrane a ciliary bud appears. Filaments form within this exterior bnd which lengthens and assumes its final form. Pictures 1-3 are general for this type of ciliogenesis. Pictures 4-7 show the formation of the rod sacs of the outer segment from the cell membrane and do not apply to normal motile cilia.

The axoneme forms free in the cytoplasm (diagram 3). Finally, the axoneme is surrounded by vesicles (diagram 4) that fuse to produce the flagellar membrane (diagram 5). Externalization is aecomplished in a manner similar to that depicted in Fig. 21. (c) further aggregation to form doublets and, (d) arrangement of the filaments to form the typical filament grouping. The latter three stages presumably occur within the external forming cilium bud. II. Internal morphogenesis with vesicles 1964). l'rotoplasmatologia III/ElF (SOROKIN 1962, RENAUD and SWIFT 3 34 III1E: P.

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