The Physiology of Fishes. Behavior by Margaret E. Brown (Eds.)

By Margaret E. Brown (Eds.)

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The Mormyridae tend to be sluggish fish but the cerebellum is of considerable size. This is chiefly because of the greatly developed valvula cerebelli which, according to Herrick ( 1905 ), contains a tract conveying chemical impressions from Nerve VII to the cerebellum. Further, since these fish produce weak electrical pulses of characteristic frequencies and are aware of pulses from individuals of the same species, it has been suggested that their large cerebellum and their large Nerve VII may be related to the perception of these electrical signals.

If he made a cut in the middle of the medulla the movements of both opercula 44 E. G. HEALEY ceased. Similar observations were made by Baudelot (1864), Vulpian (1866), and Steiner (1888). Hyde (1904) investigated the medullary respiratory center in the skate (Raja). A lesion in the medulla was followed by a reduction or even by cessation of some or all of the respiratory movements for about fifteen minutes. After this period movements began once more in stages, one gill or spiracle starting alone and the others coming into action gradually.

These volleys were associated with inward movement of the gills. Histological examination indicated that the probable source of these discharges was the neurones of the cranial motor nerves VII, IX, and X. c. The control of chromatophores. Von Frisch (1911a) traced the path of the fibers which are responsible for active aggregation of the pigment in the melanophores of the minnow (Phoxinus). By studying the chromatic reactions of the fish after section of the spinal cord and medulla at different levels combined with electrical stimulation he was able to show that these fibers arise from the medulla.

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