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The ultrastructure of a chemoreceptor organ in the head of copepod crustaceans

Elofsson, Rolf LU (1971) In Acta Zoologica 52. p.299-315
Abstract
The ultrastructure of the paired nerves, previously called frontal organ
or X-organ, in copepod crustaceans was investigated. These nerves, run-
ning from the anterior margin of the brain to the frontal edge of the
animals, are found to contain the dendrites of three types of morpho-
logically different sensory neurons. The first unit consists of two dendrites
(distinguished by their myelinization) leading to two small hairs on the
front. Their detailed structure was not investigated. The second unit
consists of a few large dendrites ending in b’ranching cilia. The latter
are surrounded by a specialized glial cell. The ciliary branches are reg-... (More)
The ultrastructure of the paired nerves, previously called frontal organ
or X-organ, in copepod crustaceans was investigated. These nerves, run-
ning from the anterior margin of the brain to the frontal edge of the
animals, are found to contain the dendrites of three types of morpho-
logically different sensory neurons. The first unit consists of two dendrites
(distinguished by their myelinization) leading to two small hairs on the
front. Their detailed structure was not investigated. The second unit
consists of a few large dendrites ending in b’ranching cilia. The latter
are surrounded by a specialized glial cell. The ciliary branches are reg-
ularly sized and arranged. The third unit consists of c. 17 dendrites
ending with cilia at the cuticle. The cilia are split into irregular branches
which are buried in modified epidermal cells which, in the case of
Calanus, are connected with cuticular pores.
By analogy with other presumed chemosensory organs in the Arthro-
poda, the second and the third unit are considered, on a morphological
basis, to be chemoreceptors. The second unit receives internal stimuli.
Because it resembles other X-organs in the Crustacea, all X-organs could
have the same function. The third unit is thought of as receiving external
stimuli.
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Acta Zoologica
volume
52
pages
299 - 315
external identifiers
  • scopus:0009333728
DOI
10.1111/j.1463-6395.1971.tb00565.x
language
English
LU publication?
yes
id
13fc50b4-90d6-4efa-b20a-f4878437cf3b
date added to LUP
2016-12-03 12:47:35
date last changed
2017-04-05 16:18:59
@article{13fc50b4-90d6-4efa-b20a-f4878437cf3b,
  abstract     = {The ultrastructure  of  the paired  nerves, previously  called  frontal organ <br/>or X-organ, in copepod crustaceans was investigated. These nerves, run- <br/>ning from  the anterior  margin  of  the brain  to  the  frontal  edge of the <br/>animals,  are found  to  contain  the  dendrites  of  three  types  of  morpho- <br/>logically different sensory neurons. The first unit consists of two dendrites <br/>(distinguished by  their myelinization)  leading to two small hairs on  the <br/>front.  Their  detailed  structure  was  not  investigated.  The  second  unit <br/>consists  of  a  few  large  dendrites  ending  in  b’ranching cilia.  The latter <br/>are surrounded  by  a  specialized glial cell.  The ciliary branches  are reg- <br/>ularly  sized  and  arranged.  The third  unit  consists  of c. 17 dendrites <br/>ending with cilia at the cuticle. The cilia are split into irregular branches <br/>which  are  buried  in  modified  epidermal  cells  which,  in  the  case  of <br/>Calanus, are connected  with  cuticular pores. <br/>By  analogy with  other presumed  chemosensory organs in  the Arthro- <br/>poda,  the second and the third  unit  are considered, on a  morphological <br/>basis,  to  be  chemoreceptors.  The second  unit  receives  internal  stimuli. <br/>Because it resembles other X-organs in the Crustacea, all X-organs could <br/>have the same function. The third unit is thought of  as receiving external <br/>stimuli. <br/>},
  author       = {Elofsson, Rolf},
  language     = {eng},
  pages        = {299--315},
  series       = {Acta Zoologica},
  title        = {The ultrastructure of a chemoreceptor organ in the head of copepod crustaceans},
  url          = {http://dx.doi.org/10.1111/j.1463-6395.1971.tb00565.x},
  volume       = {52},
  year         = {1971},
}