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*CIL – Cell Image Library accession number. Please use this to reference an image.

CIL:36704*  Cite 

A view of cross sections of the finger-like extensions of the alveoli that bind to the cytostomal cord. Alveoli store calcium (see Stelly et al., J. Cell Biol. 113:103-112, 1991) and calcium release causes the infraciliary lattice to contract. Presumably a controlled release of calcium from these fingers will result in the contraction of the cytostomal cord which is an extension of the infraciliary lattice. Such a contraction could either promote discoidal vesicle fusion with the cytopharyngeal membrane or initiate release of the nascent vacuole from the cytopharynx. TEM taken on 4/4/74 by R. Allen with Hitachi HU11A operating at 75kV. Neg. 12,750X. Bar = 0.5µm.

Technical Details

Standard glutaraldehyde fixation followed by osmium tetroxide, dehydrated in alcohol and embedded in an epoxy resin. Microtome sections prepared at approximately 75nm thickness. The negative was printed to paper and the image was scanned to Photoshop. This digitized image is available for qualitative analysis. Additional information available at (

Biological Sources
NCBI Organism Classification
Paramecium multimicronucleatum
Cell Type
cell by organism
eukaryotic cell
Eukaryotic Protist
Ciliated Protist
Cellular Component
oral apparatus
cell cortex part
Biological Context
Biological Process
oral apparatus organization
Richard Allen (University of Hawaii)
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Image Type
transmission electron microscopy (TEM)
illumination by electrons
Image Mode
detection of electrons
Parameters Imaged
electron density
Source of Contrast
stain with broad specificity
Visualization Methods
stain with broad specificity
osmium tetroxide
uranyl salt
lead salt
Processing History
recorded image
Print from negative scanned for Photoshop.
Data Qualifiers
processed data
Spatial Axis Image Size Pixel Size
X 3101px ——
Y 3128px ——