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Proposition(s) correcte(s)EL'axonème dérive du centriole distal. Ilse met en place lors de la spermiogénèse et joue un rôle essentiel dans la mobilité du spz. On retrouve 2 MT A centraux formant le doublet central entouré par 9 doublets de MT périphériques forme d'un MT A complet et d'un MT B incomplet.Les doublets périphériques sont reliés entre eux par des bras de dynéines interne et externe qui proviennent du MT A d'un doublet et qui viennent se fixer sur le MT B du doublet adjacent. Les doublets périphériques sont reliés au doublet central via les ponts radiaires (partent du MT A périph vers le MT A central) qui présentent un renflement au centre : La tête radiaire.La mise en œuvre du mouvement du spz nécessite de l'NRJ qui sera fournie par les mitochondries sous forme d'ATP qui sera hydrolysés par l'ATPase fixée aux bras de dynéine .Cette hydrolyse entraîne un accrochage/décrochag
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