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A third structure, the transverse microtubular ribbon (tr mt),
consisting of ~3 microtubules, extends to the cell's left of the basal
body and rises to the top of the ridge where it ends. Thus the
proximal end of a pair of basal bodies is firmly anchored by this
“tripod” of accessory structures, the kd, pc mt and tr mt. Presumably
this tripod will resist the torque induced on the basal bodies by the
movements of the ciliary beat and hold the proximal ends of the basal
body in a relatively rigid position. Septa (s) of the alveolar
sac system and septal pores (arrowheads) are seen in this
micrograph. EM taken on 1/12/73 by R. Allen with Hitachi HU11A TEM.
Neg. 9,900X. Bar = 0.5µm.
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