Common design in a unique midline neuropil in the brains of arthropods

Rudi Loesel, Dick R. Nässel, Nicholas J Strausfeld

Research output: Contribution to journalArticle

121 Citations (Scopus)

Abstract

Most insects possess an assemblage of midline neuropils in their protocerebrum called the central complex. Recent studies have identified comparable assemblages in the malacostracan protocerebrum. Studies of Drosophila melanogaster locomotory mutants suggest that in insects one role for the central complex might be to orchestrate limb actions. This is anecdotally supported by comparisons amongst insects suggesting that elaboration of central complex architecture correlates with complexity of limb motor repertoires. The present account describes immunocytochemical and neuroanatomical observations that reveal common design principles amongst midline neuropils in four arthropod clades, the hexapods, crustaceans, chilopods, and chelicerates and the absence of midline neuropils in diplopods. The chilopod midline neuropil, which is columnar and stratified and lacks chiasmal axons to the dorsal protocerebrum or connections to discrete satellite regions, may represent the plesiomorphous condition. The complete absence of a midline neuropil in diplopods supports previous neuroanatomical studies suggesting that the 'Myriapoda' are an artificial paraphyletic group. The columnar and layered arcuate midline neuropils of chelicerates are compared with columnar and layered midline neuropils of chilopods. No midline neuropil has been identified in a lophotrochozoan outgroup, the Polychaeta.

Original languageEnglish (US)
Pages (from-to)77-91
Number of pages15
JournalArthropod Structure and Development
Volume31
Issue number1
DOIs
StatePublished - Feb 2002

Fingerprint

Neuropil
Arthropods
arthropod
arthropods
brain
insect
limbs (animal)
insects
limb
Brain
Myriapoda
Hexapoda
Insects
axons
Polychaeta
Drosophila melanogaster
crustacean
Crustacea
mutants
Extremities

Keywords

  • Arthropods
  • Confocal imaging
  • Evolution
  • Immunocytology
  • Neuroanatomy

ASJC Scopus subject areas

  • Insect Science
  • Developmental Biology

Cite this

Common design in a unique midline neuropil in the brains of arthropods. / Loesel, Rudi; Nässel, Dick R.; Strausfeld, Nicholas J.

In: Arthropod Structure and Development, Vol. 31, No. 1, 02.2002, p. 77-91.

Research output: Contribution to journalArticle

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