. The Biological bulletin. Biology; Zoology; Marine biology. 114 N. MILBURN, E. A. WEIANT AND K. D. ROEDER Results Efferent nerve activity of the last abdominal ganglion. The effects of de- capitation or of nerve cord transection on efferent fiber activity of the last abdominal ganglion have been described in detail elsewhere (Roeder, Tozian and Weiant, 1960). In a roach with the nervous system intact, spike potentials are observed in only a few efferent fibers of the nerves supplying the phallic musculature. In those fibers which are active, spikes recur regularly and at a relatively low freq
. The Biological bulletin. Biology; Zoology; Marine biology. 114 N. MILBURN, E. A. WEIANT AND K. D. ROEDER Results Efferent nerve activity of the last abdominal ganglion. The effects of de- capitation or of nerve cord transection on efferent fiber activity of the last abdominal ganglion have been described in detail elsewhere (Roeder, Tozian and Weiant, 1960). In a roach with the nervous system intact, spike potentials are observed in only a few efferent fibers of the nerves supplying the phallic musculature. In those fibers which are active, spikes recur regularly and at a relatively low frequency. If the animal is decapitated, there is a brief injury discharge followed by a return to the previous level of activity. After five to ten minutes the number of active fibers in the phallic nerve begins to increase, and a slowly-rising crescendo of activity is observed due to a steady increase in the spike frequency in both newlyâ and previouslyâ active fibers. Typically this increased efferent discharge gradually becomes patterned into a sequence of impulse bursts. At first the bursts are isolated, but they soon become rhythmic and increase steadily in frequency for the next A ' â I II Mil I B ii m a »im* Hi mfkMftkl^^ti mm mm "inihiiiimitHiiiiii nnniniHiiiHtiiiiiiiwniiiHiiiiiiHuii »i â nitwit iimiiibii miiiil i ui ih i|y |i|k imiyi jfrll{|ll»|)Mi|iMlilliHHfrlHllff|iHI llliilWlnl III! HI]'Mini || u rip»*Wrt'l I i ill I I il l/l miBMiiiTiiiinli iiliinhii: iilninniiiiiiiii |iiin Uk i ii il"^t»>0 w^nijlifn'iii i^^»i^^tj^|>!|'^ni> nnH^f»i|^^*fft {li^WI w»^iM1»|i^^i<i*i'Hii^ n*»tii«i<t »iwi nnnMi hh. Figure 2. A. Oscilloscope record of impulses on the phallic nerve of a normal cockroach, followed by a polygraph record showing the integrated electrical activity from the same nerve. B-E. Oscilloscope records from the same nerve. The roach had been decapitated twenty minutes before the record was made. Note the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
