By David Phillips (Auth.)

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Th edista l centriole ,whic hserveda sa basal bodyfo rth eflagellum asi tformed,characteristicall ydisappearsduringmam - Fig. A matur espermatozoono fth ejellyfis h Naustihoe. I nthi sspecies,a nelaboratestructurei sassociatedwit hth edista lcentriole. Th e9 + 2 flagellumha sn o accessor ystructures,an da smal l numbero f mitochondria ,generallyfour ,ar elocateddi rectly behin dth ehea di na radia larray . Th e proxima l par to fth etai lha sa peculiarhair y coatconsistingo fslenderfibrils. (F )Cros ssec tiono fth etai l a tth eleve lo fth een dpiece.

Late rth eannulusmove s downth eaxia lfilament complexunti li tcome st oth e fibrous sheathwher ei tstops,forminga boundary be tweenth emidpiecean dprincipal piece. Theannulu si sbelievedt oderiv ei npar tfro ma largefibrouselectron-dens estructure,termedth echro matoidbod y(44). I tha sbee n suggeste dtha tth ematerial tha tcomposesth echromatoidbod yi so fnuclearorigi nan dpassesthroughnu clearpore s(37, 85), o rtha tth echromatoidbod y arisesfro mcytoplasmic-dens ematerial tha taggregates inassociationwit hmitochondria(46).

Inspermatozoa ,however,the y appeart orepresenta permanen tfeatureo fa shortregiono fth eflagellum. Fig. Fuzz y materia l surroundingth efibrous sheat hi s characteristi co fopossumspermatozoa. Fig. Cros ssectionsthroughvariou slevel so fth e principa l piec ean den dpiec eo flat espermatidso fth eChinesehamster. 29 )(43). Th emitochondrial derivative si nsomespeciesar eseveral hundredmicrons longan doccup ymos to fth evolum eo fth ecell . Restin gguineapi gsper matozo aals ohav eth ecentral pai rslightl yobliquet o theplac eo fflatteningo fth esper mhea d(42).

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Spermiogenesis by David Phillips (Auth.)
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