Summary
The anterior oesophageal sensilla (AOS) of Astacus astacus are short cuticular cylinders with a terminal pore. Three sensory cells belong to each AOS, two of them having a dendritic ciliary segment of about 2 μm length (A-cells), the third having this segment about 12 μm long (B-cell). The ciliary A-tubules in the B-cells only possess arms and an electron-dense core. The dendritic inner segments of the A-cells terminate 3–6 μm distal of the B-cells. The dendritic tips of most A-cells are connected by desmosomes. All dendritic inner segments contain a ciliary rootlet and are accompanied by a scolopale within the innermost enveloping cell. There are four enveloping cells, three of which form thin subepithelial columns together with the enclosed sensory cells. Recordings from the posterior branch of the anterior oesophageal nerve containing the axons of the AOS revealed the presence of three types of sensory cells, two being chemosensitive and one mechanosensitive. One chemoreceptor is specifically sensitive to nicotinamide, but responded also to β-NAD, 6-aminonicotinamide, nicotinamide methyl esther and nicotin. It was blocked by p(4)-acetylpyridine. The second chemoreceptor responded only to crayfish gastric fluid. The mechanoreceptors reacted to stretch of the oesophageal wall adapting only slowly to maintained stimuli. It is assumed that the A-cells are the chemosensitive cells and the B-cells the mechanosensitive ones. The latter show only a small number of modality-specific characteristics. Several structural features appear to be correlated with the location of the AOS within a flexible surface, which undergoes considerable dilation.
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References
Ache BW (1982) Chemoreception and thermoreception. In: Bliss DE (ed) The biology of crustacea. Vol 3. Neurobiology: Structure and Function. Academic Press, New York London, pp 369–398
Aicher B, Markl H, Masters WM, Kirschenlohr HL (1983) Vibration transmission through the walking legs of the fiddler crab Uca pugilator (Brachyura, Ocypopidae) as measured by laser doppler vibrometry. J Comp Physiol 150:483–491
Allen EJ (1894) Studies of the nervous system of Crustacea. II The stomatogastric system of Astacus and Homarus. Q J Microsc Sci 36:483–496
Altner H (1975) The microfiber texture in a specialized plastic cuticle area within a sensillum field on the cockroach maxillary palp as revealed by freeze fracturing. Cell Tissue Res 165:79–88
Altner H, Altner I (1986) Sensilla with both, terminal pore and wall pores on the proboscis of the moth, Rhodogastria bubo Walker (Lepidoptera: Arctiidae). Zool Anz (Jena) (in press)
Altner I, Hatt H, Altner H (1983) Structural properties of bimodal chemo- and mechanosensitive setae on the pereiopod chelae of the crayfish, Austropotamobius torrentium. Cell Tissue Res 228:357–374
Ball EE, Cowan AN (1977) Ultrastructure of the antennal sensilla of Acetes(Crustacea, Decapoda, Natantia, Sergestidae). Philos Trans R Soc Lond [Biol] 277:429–457
Bauer U, Hatt H (1980) Demonstration of three different types of chemosensitive units in the crayfish claw using a computerized evaluation. Neurosci Lett 17:208–214
Bauer U, Dudel J, Hatt H (1981) Characteristics of single chemoreceptive units sensitive to amino acids and related substances in the crayfish leg. J Comp Physiol 144:67–74
Bender M, Gnatzy W, Tautz J (1984) The antennal feathered hairs in the crayfish: a non-innervated stimulus transmitting system. J Comp Physiol A 154:45–47
Corbière-Tichané G (1975) L'organe de Johnston chez l'imago de Speophyes lucidulus Delar (Coléoptère cavernicole de la sousfamille des Bathysciinae). Ultrastructure. J Microsc 22:55–68
Crouau Y (1981) Cytology of various antennal setae in a troglobitic Mysidacea (Crustacea). Zoomorphology 98:121–134
Crouau Y (1983) Ultrastructure study of the 9+0 type cilia of insect and crustacean chordotonal sensilla. Generalisation of the hypothesis on the motility of the 9+0 type cilia. J Submicrosc Cytol 15:295–299
Dando MR, Maynard DM (1974) The sensory innervation of the foregut of Panulirus argus (Decapoda Crustacea). Mar Behav Physiol 2:283–305
Glauert AM (1974) Fixation, dehydration and embedding of biological specimens. In: Glauert AM (ed) Practical methods in electron microscopy. Vol. 3. North Holland/American Elsevier, Amsterdam Oxford New York, pp 1–207
Gnatzy W, Schmidt M, Römbke J (1984) Are the funnel-canal organs the “campaniform sensilla” of the shore crab Carcinus maenas (Crustacea, Decapoda)? I Topography, external structure and basic organization. Zoomorphology 104:11–20
Hatt H, Bauer U (1980) Single unit analysis of mechano- and chemosensitive neurons in the crayfish claw. Neurosci Lett 17:203–207
Hatt H, Schmiedel-Jakob I (1985) Specific antagonists at the pyridine receptor: evidence from electrophysiological studies with acetylpyridines. Chemical Senses 10:317–323
Kouyama N, Shimozawa T (1982) The structure of a hair mechanoreceptor in the antennule of crayfish (Crustacea). Cell Tissue Res 226:565–578
Kouyama N, Shimozawa T, Hisada M (1981) Transducing element of crustacean mechano-sensory hairs. Experientia 37:379–380
Krauhs E, Dörsam H, Little M, Zwilling R, Ponstingl H (1982) A protease from Astacus fluviatilis as an aid in protein sequencing. Anal Biochem 119:153–157
Laverack MS (1975) Properties of chemoreceptors in marine crustacea. In: Denton DA, Coghlan JP (eds) Olfaction and Taste V. Academic Press, New York, pp 141–146
Mei N (1983) Sensory structures in the viscera. In: Ottoson D (ed) Progress in sensory physiology, vol 4. Springer, Berlin Heidelberg New York Tokyo, pp 1–43
Moulins M (1976) Ultrastructure of chordotonal organs: In: Mill PJ (ed), Structure and function of proprioceptors in the invertebrates. Chapman and Hall, London, pp 387–426
Orlov J (1926) Die Innervation des Darmes des Flußkrebses. Z Mikrosk Anat Forsch 4:101–148
Robertson RM, Laverack MS (1979) Oesophageal sensors and their modulatory influence on oesophageal peristalsis in the lobster, Hotmarus gammarus. Proc R Soc Lond [Biol] 206:235–263
Schmidt K (1969) Der Feinbau der stiftführenden Sinnesorgane im Pedicellus der Florfliege (Chrysopa) Leach (Chrysopidae, Planipennia). Z Zellforsch 99:357–388
Schmidt M, Gnatzy W (1984) Are the funnel-canal organs the ‘campaniform sensilla’ of the shore crab, Carcinus maenas (Decapoda, Crustacea)? II Ultrastructure. Cell Tissue Res 237:81–93
Schöne H, Steinbrecht RA (1968) Fine structure of statocyst receptor of Astacus fluviatilis. Nature 220:184–186
Selverston AI, Russell DF, Müller JP, King DG (1976) The stomatogastric nervous system: structure and function of a small neural network. Prog Neurobiol 7:215–289
Zwilling R, Jakob F, Bauer H, Neurath H, Enfield D (1979) Crayfish carboxypeptidase, affinity chromatography, characterization and amino-terminal sequence. Eur J Biochem 94:223–229
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Supported by the Deutsche Forschungsgemeinschaft (H.A.:SFB 4/G1; H.H.: HA 1201/1-4)
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Altner, H., Hatt, H. & Altner, I. Structural and functional properties of the mechanoreceptors and chemoreceptors in the anterior oesophageal sensilla of the crayfish, Astacus astacus . Cell Tissue Res. 244, 537–547 (1986). https://doi.org/10.1007/BF00212531
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DOI: https://doi.org/10.1007/BF00212531