鳜脑及脑神经形态的研究

STUDIES ON MORPHOLOGY OF THE BRANIN AND CRANIAL NERVERS FOR THE MANDARIN FISH SINIPERCA CHUATSI (BASILEWSKY)

对鳜脑及脑神经的外部形态的研究,发现鳜脑的形态与其生活习性相适应。鳜脑的视叶特别发达,延脑有明显突出的听结节和迷叶隆起;大脑发达,纹状体有分叶,由此可推测鳜的摄食活动是各种感觉功能的综合作用,其中视觉为主,其次是侧线的感觉;嗅觉及味觉起着辅助作用。鳜小脑体大,侧叶发达;间脑血管囊大而突出的特征是对伏击式扑食的一种适应。另外,与其它鲈形目鱼类相似,鳜有“鲑”型嗅叶,三叉神经及面神经的一些分支有融合现象。

The morphology of the mandarin fish's brain and cranial nerves were studied in this report. It was discovered that the shape of the fish's brain was affected to agreat extent by the fish's habits. It was inferred from features of the fish's well developed optic lobes, the protuberant elevation of the auditory tubercula and the precesses of vagal lobe on the medulla oblongata, and the divided corpus striatum in the developed cerebrum that the fish'hunt for food is synthetical actions of various senses. Among the senses, the fish depends firstly on the vision. The sense of lateral line organ is in the second place. The smell and taste just play a supplemental role. However, the taste is indispensable to touching off swallow reflex. The mandarin fish has a big cerbella corpus, developed lateral lobes, and a big proturdent vascular sac on the diencephalon, which adapt itself to ambushing prey. The mandarin fish's brain is similar to that of other percoids for its 'salmon' type olfactory lobe and the branches of the trigeminus and facial nerves being tegether.