Plate VI. Electron micrographs of sections of sensory cilia. 



(a) Part of a longitudinal section through a rod cell of the 

 rabbit retina. The inner segment of the cell is connected to 

 the outer segment which contains the flattened sacs by a short 

 ciliary shaft containing fibrils. Below the basal body of the 

 connecting cilium is a second centriole. From De Robertis 

 and Lasansky (1958). :> 40,000. 



(b) Transverse section of the shaft of the connecting cilium 

 of a retinal rod of the rabbit. Note the absence of central 

 fibrils. X 80,000. 



(c) Transverse section through the basal body of the 

 connecting cilium of the retinal rod of the rabbit. Note the 

 nine groups of fibrils and the club-shaped appendages. 



X 80,000. 

 (b) and (c) from Tokuyasu and Yamada (1959). 



(d) Longitudinal section through the base of a scolopale 

 cilium of Locusta at the apex of the sensory dendrite. The 

 ciliary shaft runs in an extracellular space enclosed by thickened 

 walls of the scolopale structure. Striated ciliary roots run 

 downwards from the basal body of the cilium and pass around 

 a " root apparatus " structure, which may be a second centriole, 

 before joining to form a single large root (see also Fig. 9). 

 From E. G. Gray (1960). x 29,000. 



