Summary
Pharyngeal movements during feeding inNavanax inermis were filmed and correlated with known neural activity controlling the pharynx. Seven distinct components of feeding were identified. Occurrence of a component was in some cases fixed, in that once initiated the act went to completion, and in other cases reflex, in that tonic stimulus control was needed for the act to be maintained. As few as 2 or as many as 7 different motor acts could occur in a feeding sequence. The specific acts which make up a sequence were dependent upon the nature of the prey stimuli that elicited feeding: qualitatively as well as quantitatively different feeding sequences were elicited by prey of differing sizes or by prey which was withdrawn fromNavanax at different stages in a movement. The data indicate that the sequence of pharyngeal movements is not preprogrammed, but rather the sequence is appropriate to a specific type of prey. Flexibility in fitting a feeding sequence to the prey that elicits the sequence is achieved by combining in different ways a limited number of specific, fairly stereotyped motor acts.
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References
Benjamin PR, Rose RM (1979) Central generation of bursting in the feeding system of the snail,Lymnaea stagnalis. J Exp Biol 80:119–135
Bennett MVL (1974) Flexibility and rigidity in electrotonically coupled systems. In: Bennett MLV (ed) Synaptic transmission and neuronal interactions. Raven Press, New York, pp 153–178
Bennett MVL (1977) Electrical transmission: a functional analysis and comparison to chemical transmission. In: Kandel ER (ed) Handbook of physiology — The nervous system. Williams & Wilkins, Baltimore, pp 357–416
Blair GM, Seapy RR (1972) Selective prédation and prey location in the sea slugNavanax inermis. Veliger 15:119–124
Bulloch AGM, Dorset DA (1979a) The functional morphology and motor innervation of the buccal mass ofTritonia hombergi. J Exp Biol 79:7–22
Bulloch AGM, Dorsett DA (1979b) The integration and the patterned output of buccal motoneurons during feeding inTritonia hombergi. J Exp Biol 79:23–40
Cappell MS, Hall DH, Susswein AJ, Spray DC, Bennett MVL (1979) Identified motoneurons innervate identified pharyngeal muscle bands and regions inNavanax, an opisthobranch mollusc. Soc Neurosci Abstr 5:243
Cappell MS, Spray DC, Hall DH, Bennett MVL (1980) Peristaltic swallowing inNavanax: Functional organization of circumferential muscle and motor units. Soc Neurosci Abstr 6:585
Davis WJ, Siegler MS, Mpitsos GJ (1973) Distributed neuronal oscillators and efference copy in the feeding system ofPleurobranchaea. J Neurophysiol 36:258–274
Gelperin A, Chang JJ, Reingold SC (1978) Feeding motor program inLimax. I. Neuromuscular correlates and control by chemosensory input. J Neurobiol 9:285–300
Kandel ER (1976) Cellular basis of behavior: An introduction to behavioral neurobiology. Freeman, San Francisco
Kandel ER (1979) Behavioral biology ofAplysia: A contribution to the comparative study of opisthobranch molluscs. Freeman, San Francisco
Kaneko CRS, Merickel M, Kater SB (1978) Centrally programmed feeding inHelisoma: Identification and characteristics of an electrically coupled premotor neuron network, Brain Res 146:1–21
Kater SB (1974) Feeding inHelisoma trivolvis: the morphological and physiological bases of a fixed action pattern. Am Zool14:1017–1036
Kater SB, Rowell CHF (1973) Integration of sensory and centrally programmed components in generation of cyclical feeding activity ofHelisoma trivolvis. J Neurophysiol 36:142–155
Kohn AJ (1983) Feeding and digestion in gastropods. In: (ed) The mollusca, vol 5, Physiology, part 2. Academic Press, New York, pp 1–64
Kupfermann I (1974) Feeding inAplysia: a simple system for the study of motivation. Behav Biol 10:1–26
Levitan H, Tauc L, Segundo JP (1970) Electrical transmission among neurons in the buccal ganglion of a mollusc,Navanax inermis. J Gen Physiol 55:484–496
Murray MJ (1971) The biology of a carniverous mollusc: Anatomical, behavioral and electrophysiological observations onNavanax inermis. PhD dissertation, University of California, Berkeley, 149 pp
Paine RT (1963) Food recognition and predation on opisthobranchs byNavanax inermis (Gastropoda: Opisthobranchia). Veliger 6:1–9
Reingold SC, Gelperin A (1980) Feeding motor programme inLimax. II. Modulation by sensory inputs in intact animals and isolated central nervous systems. J Exp Biol 85:1–20
Rose RM (1971) Patterned activity of the buccal ganglion on the nudibranch mollusc,Archidoris pseudoargus. J Exp Biol 55:185–204
Rose RM (1972) Burst activity in the buccal ganglia ofAplysia depilans. J Exp Biol 56:735–754
Rose RM, Benjamin PR (1979) The relationship of the central motor pattern to the feeding cycle ofLymnaea stagnalis. J Exp Biol 80:127–163
Siegler MVS (1977) Motor neuron coordination and sensory modulation in the feeding system of the molluscPleurobranchaea. J Exp Biol 71:27–48
Siegler MVS, Mpitsos GJ, Davis WJ (1974) Motor organization and generation of rhythmic feeding output in the buccal ganglion ofPleurobranchaea. J Neurophysiol 37:1173–1196
Spira ME, Bennett MVL (1972) Synaptic control of electrotonic coupling between neurons. Brain Res 37:294–300
Spira ME, Spray DC, Bennett MVL (1976) Electrotonic coupling: effective sign reversal by inhibitory neurons. Science 194:1065–1067
Spira ME, Spray DC, Bennett MVL (1980) Synaptic organization of expansion motoneurons ofNavanax inermis. Brain Res 195:241–270
Spray DC, Cappell M, Bennett MVL (1977) Spontaneous and evoked depolarizations in protractor muscles of the opisthobranch mollusc,Navanax. Neurosci Abstr 3:337
Spray DC, Spira ME, Bennett MVL (1980a) Peripheral fields and branching patterns of buccal mechanosensitive neurons in the opisthobranch mollusc,Navanax inermis. Brain Res 182:253–270
Spray DC, Spira ME, Bennett MVL (1980b) Synaptic connections of buccal mechanosensory neurons in the opisthobranch mollusc,Navanax inermis. Brain Res 182:271–286
Susswein AJ, Bennett MVL (1979) Plasticity of feeding behavior in the opisthobranch molluscNavanax. J Neurobiol 10:521–534
Susswein AJ, Cappell MS, Spray DC, Bennett MVL (1979) A cinematographic analysis of feeding in the opisthobranch mollusc,Navanax. Neurosci Abstr 5:262
Susswein AJ, Cappell M, Bennett MVL (1982) Distance chemoreception inNavanax inermis. Mar Behav Physiol 8:231–241
Weiss KR, Kupfermann I (1977) Serotonergic neuronal activity and arousal of feeding inAplysia californica. Soc Neurosci Symp 3:66–89
Willows AOD (1978) Physiology of feeding inTritonia. I. Behavior and mechanics. Mar Behav Physiol 5:115–135
Willows AOD (1980) Physiological basis of feeding behavior inTritonia diomedea. II. Neuronal mechanisms. J Neurophysiol 44:849–861
Woollacott M (1974) Patterned neural activity associated with prey capture inNavanax (Gastropoda, Aplysiacea). J Comp Physiol 94:69–84
Zimering MB, Spray DC, Bennett MVL (1981) Synaptic relations underlying swallowing and regurgitation inNavanax, an opithobranch mollusc. Soc Neurosci Abstr 7:138
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Susswein, A.J., Achituv, Y., Cappell, M.S. et al. Pharyngeal movements during feeding sequences inNavanax inermis: a cinematographic analysis. J. Comp. Physiol. 155, 209–218 (1984). https://doi.org/10.1007/BF00612638
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DOI: https://doi.org/10.1007/BF00612638