A higher magnification view that shows the bilayer nature of the ciliary membrane, plasma membrane and the outer and inner (alveolar sac membranes of the alveoli. The 9-doublet + 2-singlet microtubula...

A cell with a flat alveolar sac system. It is not clear why some cells have expanded alveoli and others have flattened alveoli. Cacodylate buffered fixative. TEM taken on 2/3/69 by R. Allen with Phil...

Cross section of a cilium showing the 9 + 2 axoneme. Two dynein arms, inner and outer, of heterogeneous appearance arise from the complete microtubule of each doublet. Spokes extend from the doublets ...

Cross sections of a pair of basal bodies showing the triplet makeup of the 9 fibers; only one microtubular fiber is complete in each triplet while the other two microtubular fibers share some subunits...

Kinetodesmal fibers arise from the proximal ends of the basal bodies and curve upward and to the cell’s right of the kinety. Together with kds arising from more posterior basal bodies they form a st...

The scopula, stalk-forming region, is outlined by a circle of basal bodies that produce short modified cilia. Other basal bodies lie within this circle. The sheath is secreted outside the circle of ci...

Tangential section through the anterior half of the cytopharyngeal basket. Drawings and discussion of the basket can be found in a paper by Tucker, J. Cell Science 3: 493-514, 1968. TEM taken on 4/1/6...

A high magnification view of the paracrystalline structure of the trichocyst tip and the cortex and core of the resting trichocyst body. Details of the sheath around the tip spike are also shown. (For...

Detail of the filamentous reticulum along the left side of the cytopharynx from which cytopharyngeal ribbons arise next to its nodes. Quadrulus associated ribbons lie between the filamentous reticulum...

This section is cut at a level where the macronucleus is folded so it appears to be in 2 parts and where the micronucleus is visible. Contractile vacuole, perioral kinetids, and the peristome is evide...