. Il bollettino biologico. Biologia; Zoologia; biologia; biologia marina. Ventilazione e nuoto in LIMULUS 4fr#" * * m^^ t i Se ™ T se "' ^tW^v^^^.t..|ven>.,,,"("^r^^M^lM^^* ...mi^i^^i^ B. D |4^>v^ . j t i^yMfw^^^^ 5fl^ figura 1. E flessore estensore burst durante la ventilazione e iperventilazione. (A) esemplifica le reciproche attività nei flessori (top) e estensore (fondo) muscoli durante la ventilazione come registrato dalla muscolatura della prima piastra gill. (B) è un sistema integrato di registrazione (A) mostra la forma simmetrica del flessore e muscoli estensori burst (una flessione verso il basso indi

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. VENTILATION AND SWIMMING IN LIMULUS 4fr#»**m^^ T i If ™ T if "' ^tW^v^^^.t..|fri>., , , »(„^r^^M^lM^^* ...i^i^^i^ B. D |4^>v^ . j t i^yMfw^^^^ 5fl^ FIGURE 1. Flexor and extensor bursts during ventilation and hyperventilation. (A) exemplifies the reciprocal activity in flexor (top) and extensor (bottom) muscles during ventilation as recorded from the musculature of the first gill plate. (B) is an integrated record of (A) showing the symmetrical shape of the flexor and extensor muscle bursts (a downward deflection indicates activity). In (C) an integrated record of flexor (top) and extensor (bottom) bursts during gradual transitions from ventilation to hyperventilation and back to ventilation demonstrate the concomitant transformations of the flexor burst shape from symmetrical to saw-tooth, and of the extensor burst shape from symmetrical to double peaked. (D) shows double peaked extensor bursts in the first (top) and fourth (bottom) gill plates during hyperventilation. The first activity peak (1) in both muscles is consistantly strong, whereas the second activity peak (2) is considerably weaker in the more caudal muscle. Bar indicates 5 sec. branchial muscle (Fig. Ib). These muscle burst shapes correlate with the sym- metrical motoneuron firing patterns in the external branchial nerve and medial branchial nerve as recorded by Fourtner et al. (1971). Electromyograms from extensor and flexor muscles indicate that the following elements of the ventilatory burst cycle are variable: (1) the number of participating appendages; (2) the muscle burst interval; (3) the intersegmental delay of muscle. 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 work.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laborato