. Brain and body of fish; a study of brain pattern in relation to hunting and feeding in fish. Fishes -- Anatomy; Nervous system -- Fishes; Brain. CHAPTER VII THE CENTRAL ACOUSTIC LOBE Having described the accessory organ of the herring we can now turn to the consideration of the brain pattern of this fish, a typical plankton feeder, and see whether it throws any light on the central acoustic area we have described in the surface-feeding carps. The medulla of a herring is much concentrated and has a well-marked median lobe, projecting from the back of the cerebellum. This lies in the position
. Brain and body of fish; a study of brain pattern in relation to hunting and feeding in fish. Fishes -- Anatomy; Nervous system -- Fishes; Brain. CHAPTER VII THE CENTRAL ACOUSTIC LOBE Having described the accessory organ of the herring we can now turn to the consideration of the brain pattern of this fish, a typical plankton feeder, and see whether it throws any light on the central acoustic area we have described in the surface-feeding carps. The medulla of a herring is much concentrated and has a well-marked median lobe, projecting from the back of the cerebellum. This lies in the position of the facial lobe of a carp, but microscopical examination shows that it is connected with the acoustic tubercles and has no anatomical relation with the facial nerve. When serial sections are traced beginning at the hinder margin of this lobe, we find that, resting on the fifth lobe, are two wings of tissue that meet dorsally. These consist of groups of round cells between which nerve fibres run, to meet at the apex, while an interrupted layer of round cells forms a cortex. As the sections are followed for- wards these wings become thicker and finally have the shape of a pear in section, surrounded by a dorsal exten- sion of the basal tissue, from which it springs. Further forward the com- mencement of the cerebellum is seen lying dorsal to this central lobe, and at the lateral margins the acoustic tubercles commence to make their ap- pearance ; nerve fibres are seen passing from these transversely towards the central lobe. The eighth or auchtory nerve is seen entering laterally and forming a distinct bundle of fibres which approaches the central -Y(jo6e. V. Fig. vi. Section of Brain of Herring. -Lobe (somatic-sensory lobe). Facial nerve. —Facial lobe. 58. 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 origina
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectbrain
