. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. 84 COMPARATIVE PHYSIOLOGY OF THE BRAIN S /-. .o. regulates and guides the activity of the other ganglia? In our analysis of the nerve-functions we will begin with the earthworm. We will consider first its pro- gressive movements, and will attempt to answer the question, Does coordinated progressive movement, in which all the segments of C. the body participate, de- pend upon the brain (<?, Figs. 27 and 28) ? The locomotion of the earth- worm is a very simple process. The setse play an important
. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. 84 COMPARATIVE PHYSIOLOGY OF THE BRAIN S /-. .o. regulates and guides the activity of the other ganglia? In our analysis of the nerve-functions we will begin with the earthworm. We will consider first its pro- gressive movements, and will attempt to answer the question, Does coordinated progressive movement, in which all the segments of C. the body participate, de- pend upon the brain (<?, Figs. 27 and 28) ? The locomotion of the earth- worm is a very simple process. The setse play an important role, although they are not visible to the naked eye; they act like locomotor appendages and give the animal a hold on FIG. 27. DORSAL VIEW OF THE CEN- the ground. The real mus- TRAL NERVOUS SYSTEM OF AN des Q{ locomotion how. EARTHWORM. ever, are contained in the 0, supraoesophageal ganglion ; c, commissure ; «, suboesophageal ganglion ;.?, pharynx ; CUtanCOUS ITlUSCle - layCT. G, ganglia of the ventral cord. . 1 his consists of ring-fibres and longitudinal fibres. When the worm begins to move, the ring-fibres contract first, causing the worm to become longer and thinner. The bristles are turned backward and, because of the resistance of the ground, prevent the animal from moving back- ward. In this way the head is pushed forward. As soon as the maximum elongation has been reached,. 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 Loeb, Jacques, 1859-1924. New York, G. P. Putman's Sons; [etc. , etc. ]
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