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rhabdom
[ rab-duhm, -dom ]
noun
- any of various rod-shaped structures.
- the rod-shaped portion of an arthropod ommatidium.
Other Words From
- rhab·do·mal [rab-, doh, -m, uh, l, rab, -d, uh, -m, uh, l], adjective
Word History and Origins
Example Sentences
Insect eyes are made of thousands of hexagonal columns called ommatidia, each of which focuses light through a lens down a transparent tube called a rhabdom to a set of photosensitive cells at the bottom.
B, Rhabdom of the same, consisting of five confluent rhabdomeres.
C, Transverse section of the rhabdom of a retinula of the scorpion’s central eye, showing its five constituent rhabdomeres as rays of a star.
Whilst each unit of the lateral eye of Limulus has a rhabdom of ten3 pieces 292 forming a star-like chitinous centre in section, each lateral eye of Scorpio has several rhabdoms of five or less rhabdomeres, indicating that the Limulus lateral eye-unit is more specialized than the detached lateral eyelet of Scorpio, so as to present a coincidence of one lens with one rhabdom.
From the distal ends of the cells are secreted chitinous rhabdomeres, forming a rhabdom which occupies and fills up the central portion of the cup beneath the middle of the corneal lens.
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