Nonimpulsive Afferent Coding and Stretch Reflexes in Crabs
Like most other branches of crustacean neurobiology, that of the physiological responses of individual proprioceptor neurons was pioneered by C. A. G. Wiersma and co-workers. Impulses in the single afferent fibers of the crayfish abdominal muscle receptor organs (MROs) were first recorded by Wiersma et al. (1953). Later, Wiersma was the first to record single-unit responses from the chordotonal organs of crustacean legs, distinguishing movement-sensitive and position-sensitive afferent fibers for either direction of the joint (Wiersma and Boettiger, 1959). Proprioceptive information in crustacean limbs, therefore, as in other jointed-limb animals including vertebrates, undergoes “parallel processing” (cf. Wiersma, 1962, 1974) via multiple afferent channels, and is encoded and conducted centrally in the most prevalent manner, namely, a frequency-modulated pulsatile code. This applies to all the joints in the thoracic limbs of decapod crustaceans except the most basal, thoracicocoxal joint.
KeywordsAfferent Fiber Receptor Potential Stretch Reflex Receptor Muscle Chordotonal Organ
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