Developmental Neurobiology of the Leech

摘要: The leech CNS consists of a ventral chain 32 segmentally iterated ganglia. first four and last seven segmental ganglia are fused, constituting rostral caudal ganglionic mass, respectively. or subesophageal ganglion, is connected at its anterior end to dorsally situated supraesophageal ganglion. Each ganglion contains about 400 bilaterally paired neurons, as well few unpaired neurons. Their somata form cortex around the outer surface neurons monopolar; their processes project into central neuropil, where they make synaptic contacts. From there, some other via connective nerve. Sensory effector targets outside nerves, whose roots emerge from lateral edge In each neuronal distributed over six cell packets, which two an posterior pair packets. remaining packets unpaired, one lying on ventromedial aspect. packet giant glial cell, whereas cells associated with neuropil. Additional glia present in interganglionic nerves.