An anatomically unusual cilium is found in which ocular structure?
a. In connective tissue cells of the choroid
b. In rod photoreceptor cells, at the junction of the inner segment with the outer segment
c. On smooth muscle cells of the constrictor pupillae
d. On the surface of epithelial cells of the ciliary processes
e. Projecting from pigment epithelial cells of the retina
The outer segment of a rod cell represents a highly modified, single cilium. This is not so sur-prising, in view of the fact that single cilia seem to function as sensory structures for other cells, such as central nervous system neurons and epithelial cells in collecting ducts of the kidney.
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