. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 166 J- K. LACOURSE AND R. B. NORTHROP. FIGURE 5. Independence of mechanoreceptors' tiring through rising and falling tension. Rising tension receptors indicated by a positive sign ; fire with larger amplitude than falling tension receptors indicated by a negative sign. The total sweep is one sec, and the stimulus is one cycle per second with a resting tension of 6 grams and a ppk value of 4 grams. light microscope by LaC'ourse (19/7) in the AHRM of Mytilns. In addition to Gilloteatix's description of the association, LaOmrse
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 166 J- K. LACOURSE AND R. B. NORTHROP. FIGURE 5. Independence of mechanoreceptors' tiring through rising and falling tension. Rising tension receptors indicated by a positive sign ; fire with larger amplitude than falling tension receptors indicated by a negative sign. The total sweep is one sec, and the stimulus is one cycle per second with a resting tension of 6 grams and a ppk value of 4 grams. light microscope by LaC'ourse (19/7) in the AHRM of Mytilns. In addition to Gilloteatix's description of the association, LaOmrse has observed a bipolar cell, just before the nerve of the neuromuscnlar association terminates in the muscle fiber. LaCourse (1977) speculated that the bipolar cell is probably the soma of a sensory neuron, and the total bipolar cell with the neuromuscular structure is a mechanoreceptor. Similar bipolar cells have been observed embedded in connective tissue around the shafts of thick apodemes of the tailspine muscle of Liinnliis polvplicinus ( Kagles and Hartman. 1975). Fagles and Hartman speculated that these bipolar cells are tension receptors. It is suggested by the present authors that the A MUM contains mechanorecep- tors. These sensory receptors shown in the present electrophysiological study may arise from the morphologically observed neuromuscular associations described above. From the results of the present investigation and evidence cited in the previous discussion, a speculative model for phasic contraction of the AP>KM of Mytilus is offered. Figure 6 is a schematic representation of the model. The contractor in- nervation is assumed to arise in or beyond the pedal ganglion (from morphological observation of nerve tracts connecting the pedal nerve to the cerebropedal connec- tive nerve, LaCourse, 1977). pass anteriorly along the cerebropedal connective nerves, through the visceral nerves to the middle third of the ABRM. There it branches into a fine nerve plexus
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
