. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Cd++ Figure 3. Effect of Cd^^ on potentials recorded from the postsynaptic giant axon. a. Infusion of Cd^* (1 mAf) resulted in the disappearance of the synaptically evoked action potential, elimination of the EPSP, and a decline in the resting potential, b. Washout of Cd^* was followed by a reappearance of the EPSP and the action potential and a gradual recovery of the resting potential (retouched). Calibration: amplitude = 20 mV, time = 5 s. reduction in the EPSP to below threshold and eventually to a complete disappear
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Cd++ Figure 3. Effect of Cd^^ on potentials recorded from the postsynaptic giant axon. a. Infusion of Cd^* (1 mAf) resulted in the disappearance of the synaptically evoked action potential, elimination of the EPSP, and a decline in the resting potential, b. Washout of Cd^* was followed by a reappearance of the EPSP and the action potential and a gradual recovery of the resting potential (retouched). Calibration: amplitude = 20 mV, time = 5 s. reduction in the EPSP to below threshold and eventually to a complete disappearance (Fig. 5). However, Ca^^-free medium reduced the EPSP at a slower rate than the other treatments, eliminating the synaptically evoked action potential in 13 ± 7 s, and the EPSP in 35 ± 12 s (n = 4) (minimum 5 s and 18 s, respectively). Reperfusion with Ca^^-containing ASW resulted in transmission recovery. Discussion The blood system of the squid has been described by Williams (1909), but the arterial system supplying the stellate ganglia was not discussed in detail in this classical study. The heart is situated between the gills in the caudal region of the mantle cavity and the aorta runs rostrally, penetrates the muscular coat of the digestive gland, and passes between the digestive gland muscle wall and the gland itself, terminating in the head. Just rostral to the level of the stellate ganglia the aorta sends a single branch through the digestive gland muscle wall which bifurcates to supply the two stellate ganglia. These arteries continue beyond the ganglia as the major blood supply for the rostral mantle. Thus, cannulation of the aorta together with appropriately positioned. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Labora
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