The Motor Innervation and Musculature of the Antennule of the Hermit Crab, Pagurus Alaskensis (Benedict)
Open Access
- 1 June 1973
- journal article
- Published by The Company of Biologists in Journal of Experimental Biology
- Vol. 58 (3) , 767-784
- https://doi.org/10.1242/jeb.58.3.767
Abstract
1. The motor innervation and musculature of the medial and distal segments of the hermit-crab antennule have been described anatomically. 2. Intracellular recordings within these muscles and simultaneous monitoring of whole-muscle tension have been used to define the motoneurones and contractile properties of the muscle fibres they innervate. 3. The motor system consists of two fast, two slow and one mixed muscle which are innervated by seven motoneurones. 4. The motor innervation is such that this system may be divided into three components: phasic, phasic-tonic and tonic. The possible involvement of these components in the antennular activities is discussed. 5. The tonic component is adapted to produce fine tonic tension in response to relatively low-frequency (5-10/sec) motoneurone discharge. It is suggested that this may be important for the postural control of appendages which, owing to the density of the environmental medium, are relatively weightless. 6. No evidence of postsynaptic inhibition was found, and this is discussed in relation to the movements of the antennule.Keywords
This publication has 27 references indexed in Scilit:
- Structure and neuromuscular physiology of a newly discovered muscle in the walking legs of the lobster Homarus americanusJournal of Experimental Zoology, 1971
- Swimming behavior of the sand crab, Emerita analoga (Crustacea, Anomura)Journal of Comparative Physiology A, 1971
- ELECTRICAL AND MECHANICAL CHARACTERISTICS OF A VERY FAST LOBSTER MUSCLEThe Journal of cell biology, 1969
- The neuromuscular basis of lobster swimmeret beatingJournal of Experimental Zoology, 1968
- The neurophysiology of respiration in decapod crustacea. I. The motor systemCanadian Journal of Zoology, 1968
- Correlated physiological and ultrastructural studies on specialised muscles. Ia. Neuromuscular physiology of the levator of the eyestalk ofPodophthalmus vigil (Weber)Journal of Experimental Zoology, 1968
- Phasic and tonic neuromuscular systems in the abdominal extensor muscles of the crayfish and rock lobsterComparative Biochemistry and Physiology, 1966
- Excitation and inhibition in crab muscle fibresComparative Biochemistry and Physiology, 1965
- Differences in muscle fibre properties as a factor in “fast” and “slow” contraction in CarcinusComparative Biochemistry and Physiology, 1963
- Coupling of membrane potential to contraction in crustacean musclesThe Journal of Physiology, 1958