. The elementary nervous system. Nervous system; Nervous system -- Coelenterata. Fio. 27.—Metridium cut through verti- cally except for its oral disc. Stimulus ap- plied at x. FIG. 28.—Metridium cut through verti- cally except for its aboral disc. Stimulus applied at x. onstrating transverse nervous connections in the oral disc. If the sea-anemone is cut through vertically as de- scribed in the preceding paragraph, except that the con- necting portion is the pedal disc instead of the oral disc (Fig. 28), the stimulation of one part is followed by the retraction of the halves of the oral disc i
. The elementary nervous system. Nervous system; Nervous system -- Coelenterata. Fio. 27.—Metridium cut through verti- cally except for its oral disc. Stimulus ap- plied at x. FIG. 28.—Metridium cut through verti- cally except for its aboral disc. Stimulus applied at x. onstrating transverse nervous connections in the oral disc. If the sea-anemone is cut through vertically as de- scribed in the preceding paragraph, except that the con- necting portion is the pedal disc instead of the oral disc (Fig. 28), the stimulation of one part is followed by the retraction of the halves of the oral disc in both parts. Thus the pedal disc as well as the oral disc can serve the animal for transverse nervous connections. Finally, if a sea-anemone is cut vertically in two, ex- cept for a small connecting bridge near the pedal edge of the column (Fig. 29), the mechanical stimulation of the column of one part is followed by a retraction of the halves of the oral disc in both parts. These various tests and experiments show that the. 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 Parker, George Howard, 1864-1955. Philadelphia, London J. B. Lippincott Company
Size: 1687px × 1481px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookpublisherphiladelphialondonjblipp, booksubjectnervoussystem
