Abstract
Three distinct clusters of crustacean cardioactive-peptide-immunoreactive neurones occur in the terminal abdominal ganglion of the crayfish species Orconectes limosus, Astacus leptodactylus, Astacus astacus and Procambarus clarkii, as revealed by immunocytochemistry of whole-mount preparations and sections. They exhibit similar topology and projection patterns in all four studied species. An anterior ventral lateral and a posterior lateral cluster contain one small, strongly stained perikaryon and two large, less intensely stained perikarya, each showing contralateral projections. A posterior medial lateral cluster of up to six cells also contains these two types of perikarya. Whereas the small type perikarya belong to putative interneurones, the large type perikarya give rise to extensive neurohaemal plexuses in perineural sheaths of the third roots of the fifth abdominal ganglia, the connectives, the dorsal telson nerves, the ganglion itself, its roots and arteriolar supply. Thin fibres from these plexuses reach newly discovered putative neurohaemal areas around the hindgut and anus via the intestinal and the anal nerves, and directly innervate the phasic telson musculature. A comparison with earlier investigations of motoneurones and segmentation indicates that these three cell groups containing putative neurosecretory neurones may be members of at least three neuromeres in this ganglion. Crustacean cardioactive peptide released from these neurones may participate in the neurohumoral and modulatory control of different neuronal and muscle targets, thereby exceeding its previously established hindgut and heart excitatory effects.
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Abbreviations
- AG :
-
abdominal ganglion
- adpl :
-
arteria dorsalis pleica
- Ala :
-
arreria lateralis abdominalis
- Asub :
-
arteria subneuralis
- CCAP :
-
crustacean cardioactive peptide
- CNS :
-
central nervous system
- IR :
-
immunoreactive
- LG :
-
lateral giant axon
- LTr :
-
lateral tract
- MDT :
-
medial dorsal tract
- MG :
-
medial giant axon
- M Tr :
-
medial tract
- mcan :
-
musculus compressor ani
- mfltp :
-
museulus flexor telsonos posterior
- nan :
-
nervus ani (AG6 N5)
- nant :
-
nervus anterior (AG6 N1, N2)
- nia :
-
nervus intestinal anterior
- nin :
-
nervus intestinalis (AG6 N7)
- nip :
-
nervus intestinalis posterior
- nteld :
-
nervus telsonos dorsalis (AG6 N6)
- nielv :
-
nervus telsonos ventralis (AG6 N4)
- nur :
-
nervus uropedalis (AG6 N3)
- nven :
-
nervus ventralis (AG5 N3)
- PIR :
-
peri-intestinal ring
- PTF :
-
posterior telson flexor
- VLT :
-
ventral lateral tract
- VMT :
-
ventral medial tract
- VNC :
-
ventral nerve cord
- VIF :
-
ventral telson flexor
- AVLC, PLC, PMLC :
-
anterior ventral lateral, posterior lateral, posterior medial lateral CCAP-immunoreactive cell cluster
- A6AVC, A7AVC :
-
anterior ventral commissures
- A7DCI :
-
dorsal commissure I
- A7PVC :
-
posterior ventral commissure
- A7SCII :
-
sensory commissure II
- A7VCII, A7VCIII :
-
ventral commissures II and III of the sixth (A6) and seventh (A7) abdominal neuromer
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Audebm, U., Trube, A. & Dircksen, H. Patterns and projections of crustacean cardioactive-peptide-immunoreactice neurones of the terminal ganglion of crayfish. Cell Tissue Res 272, 473–485 (1993). https://doi.org/10.1007/BF00318553
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DOI: https://doi.org/10.1007/BF00318553