The Cytological Observation Of Neurogenesis And Differentiation Of Central Nerve System In Fenneropenaeus Chinensis

Central nerve system (CNS) of crustacean could produce several kinds of neurohormones, which could regulate some physiological function such as ecdysis, procreation and development. Development and differentiation of CNS was primary studied and observed by the histological and cytological methods in Fenneropenaeus chinensis, and we also discuss the connection between the development of CNS and foundation of nerve function during development. The experiment would provide basic academic evidence for the foundation of nervous function, hormone control and phylogenetic evolution. The samples include Gastrulae, Limb buds stege, Nauplius in membrane, Nauplius (N1—N6), Zoea (Z1—Z3), Mysis (M1—M3), Post-larva (P1—P4) and 2.65cm Post-larva. The samples of Gastrulae, Limb buds stege, Nauplius in membrane, Nauplius and Zoea were observed by serial sections of agar-paraffin embedded under microscope, the samples of Mysis, Post-larva and 2.65cm Post-larva were observed by serial sections of paraffin embedded under microscope. And the samples were observed by serial sections of Epon embedded under electron microscope.The neuroblast of brain in F. chinensis originated at Gastrula stage and was in front part of Nauplius in membrane. The brain of F. chinensis originated at Nauplius stage I, which was composed of a pair of ganglions. In front part of brain, a pair of ganglions concrescenced at Nauplius stage III. The brain was differentiated into protocerebrum, deutocerebrum, tritocerebrum and olfactory lobe at Zoea stage I. Protocerebrum and the front of deutocerebrum eudipleural concrescenced. The brain mostly eudipleural concrescenced at Post-larva stage, but tritocerebrum was still...