[Role of different central nervous system structures of the crayfish Astacus leptodactylus in realizing food-getting behavior].

After cutting the nervous chain at different levels, separate fragments of motor component of foodgetting behaviour of the crayfish disappeared. Separation of the supraoesophageal ganglion from the nervous chain results in the abolition of food searching phase, control and organization of aimed locomotions, fixation of the body with respect to the target objects. At the same time the activity of separate functional blocks becomes more evident being realized in automatic regime with the trigger type of its onset. Suboesophageal ganglion structures initiate the spontaneous non-coordinated locomotor activity of the postural and locomotor apparatus and provide for realization of the whole algorhythm: grasping the food, driving the claw to the rostral part of the body, transmission the food to the II-III pairs of walking legs and then to the mouth opening. Structures of the 1st isolated thoracal ganglion realize grasping and holding reflex which is going on slowly and inactively.