rhabdom

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rhabdom

(răb′dəm, -dŏm′)
n.
A rodlike structure in the center of each ommatidium in the compound eye of an arthropod, composed of microvilli extending from the surrounding retinular cells.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

rhabdom

or

rhabdome

a transparent rod that passes down the centre of an insect or crustacean ommatidium. see EYE, COMPOUND.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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Ciliary induction of the rhabdomes seems to be improbable in the receptor cells of cuttlefish, because the cilia are always vestigial and they disappear from the receptor cells before the apical processes begin to be formed (Yamamoto 1985).