Summary
The mechanosensory innervation of the lobster (Homarus americanus) swimmeret was examined by electrophysiologically recording afferent spike responses initiated by localized mechanical stimulation of the caudal surface of the swimmeret. Two functional groups of subcuticular hypodermal mechanoreceptors innervate the swimmeret. Afferents of one group innervate the small discrete “ridges” of calcified cuticle lining the margins of both swimmeret rami. Putative ridge receptors are bipolar sensory neurons responding phasically to deformation of the ridge cuticle with the number and frequency of impulses produced dependent on stimulus strength and velocity. Afferents of the second group, which innervate substantial areas of hypodermis underlying the soft, flexible cuticular regions of the swimmeret, were designated “wide-field” hypodermal mechanoreceptors. These neurons have multiterminal receptive fields and respond phaso-tonically to cuticular distortion. The response properties of both types of hypodermal mechanoreceptors imply that they are activated during the characteristic beating movements of the swimmerets.
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References
Alexandrowicz JS (1952) Muscle receptor organs in the abdomen of Homarus vulgaris and Palinurus vulgaris. Q J Microsc Sci 92:163–199
Bent SA, Chapple WD (1977) Peripheral and central asymmetry in the swimmeret system of the hermit crab, Pagurus pollicarus. J Comp Physiol 118:75–92
Bullock TH, Horridge GA (1965) Structure and function in the nervous systems of invertebrates, Vol 1 and 2. Freeman, San Francisco
Cattaert D, Clarac F (1983) Influence of walking on swimmeret beating in the lobster Homarus gammarus. J Neurol 14:421–439
Cattaert D, Clarac F (1987) Rami motor neurons and motor control of the swimmeret system of Homarus gammarus. J Comp Physiol A 160: 55–68
Clarac F, Cattaert D, Bevengut M (1988) Control of complex limb movements during locomotion in invertebrates. In: Ambland B, Berthoz A, Clarac F (eds) Posture and gait: development, adaptation and modulation. Elsevier Sci Publ BV, Amsterdam, pp 309–320
Cobb JS (1971) The shelter-related behavior of the American lobster, Homarus americanus. Ecology 52:108–115
Cole WH (1941) A perfusing solution for the lobster (Homarus) heart and the effects of its constituent ions on the heart. J Gen Physiol 25:1–6
Davis WJ (1968a) The neuromuscular basis of lobster swimmeret beating. J Exp Zool 168:363–378
Davis WJ (1968b) Lobster righting responses and their neural control. Proc R Soc Lond B 170:435–456
Davis WJ (1968c) Quantitative analysis of swimmeret beating in the lobster. J Exp Biol 48:643–621
Davis WJ (1969a) The neural control of swimmeret beating in the lobster. J Exp Biol 50:99–117
Davis WJ (1969b) Reflex organization in the swimmeret system of the lobster. I. Intrasegmental reflexes. J Exp Biol 51:547–563
Davis WJ (1969c) Reflex organization in the swimmeret system of the lobster. II. Reflex dynamics. J Exp Biol 51:565–573
Deller SRT, Macmillan DL (1989) Entrainment of the swimmeret system of the crayfish to controlled movements of some of the appendages. J Exp Biol 144:257–278
Heitler WJ (1982) Non-spiking stretch-receptors in the crayfish swimmeret system. J Exp Biol 96:355–366
Heitler WJ (1986) Aspects of sensory integration in the crayfish swimmeret system. J Exp Biol 120:387–402
Hughes GM, Wiersma CAG (1960) The coordination of swimmeret movements in the crayfish, Procambarus clarkii (Girard). J Exp Biol 37:657–670
Ikeda K, Wiersma CAG (1964) Autogenic rhythmicity in the abdominal ganglia of the crayfish: the control of swimmeret movements. Comp Biochem Physiol 12:107–115
Jahromi SS, Atwood HL (1969) Correlation of structure, speed of contraction, and total tension in fast and slow abdominal muscle fibers of the lobster (Homarus americanus). J Exp Zool 171:25–38
Jahromi SS, Atwood HL (1971) Structural and contractile properties of lobster leg-muscle fibers. J Exp Zool 176:475–486
Kennedy D, Evoy WH, Fields HL (1966) The unit basis of some crustacean reflexes. Symp Soc Exp Biol 20:75–109
Killian KA, Page CH (1992) Mechanosensory afferents innervating the swimmerets of the lobster. II. Afferents activated by hair deflection. J Comp Physiol A 170:501–508
Killian KA, Page CH, Cipolla DA (1985) Efferent neurons of the abdominal pleopods in the lobster, Homarus americanus: sexual dimorphism and segmental variation. Soc Neurosci Abstr 11:511
Knox PC, Neil DM (1991) The coordinated action of abdominal postural and swimmeret motor systems in relation to body tilt in the pitch plane in the Norway lobster Nephrops norvegicus. J Exp Biol 155:605–627
Kotak VC, Page CH (1986a) Tactile stimulation of the swimmeret alters motor programs for abdominal posture in the lobster Homarus americanus. J Comp Physiol A 158:225–233
Kotak VC, Page CH (1986b) Sexually dimorphic mechanosensitive swimmeret sensilla affect abdominal posture in the lobster. J Neurobiol 17:421–429
Kotak VC, Page CH (1987) Synaptic responses produced in lobster abdominal postural motor neurons by mechanical stimulation of the swimmeret. J Comp Physiol A 161:695–704
Laverack MS (1964) The antennular sense organs of Panulirus argus. Comp Biochem Physiol 13:301–321
Laverack MS (1976) External proprioceptors. In: Mill PJ (ed) Structure and function of proprioceptors in the invertebrates. Chapman and Hall, London, pp 1–63
Macmillan DL, Deller SRT (1989) Sensory systems in the swimmerets of the crayfish Cherax destructor and their effectiveness in entraining the swimmeret rhythm. J Exp Biol 144:279–301
Miyan JA, Neil DM (1986) Swimmeret proprioceptors in the lobsters, Nephrops norvegicus L. and Homarus gammarus L. J Exp Biol 126:181–204
Pabst H, Kennedy D (1967) Cutaneous mechanoreceptors influencing motor output in the crayfish abdomen. Z Vergl Physiol 57:190–208
Sandeman DC (1989) Physical properties, sensory receptors and tactile reflexes of the antenna of the Australian freshwater crayfish Cherax destructor. J Exp Biol 141:197–217
Wigglesworth VB (1959) The histology of the nervous system of an insect, Rhodnius prolixus (Hemiptera) I. The peripheral nervous system. Q J Microsc Sci 100:285–298
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Killian, K.A., Page, C.H. Mechanosensory afferents innervating the swimmerets of the lobster. J Comp Physiol A 170, 491–500 (1992). https://doi.org/10.1007/BF00191464
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DOI: https://doi.org/10.1007/BF00191464