Biomaterial Database

Pathways and fine structure of neurons forming the nervi corporis allati II of the cockroach Periplaneta americana (L.). 1979

R L Pipa, and F J Novak

By back-filling the nervus corporis allati II (NCA2) with Co2+ and precipitating the sulfide, two groups of somata (A and B) are revealed on the ipsilateral side of the subesophageal ganglion (SG). These occur anteroventrally, adjacent to the midsaggital plane. Group A consists of two cells; group B of five. Their processes form two discrete tracts issuing dorsoposteriorly into the neuropile between and slightly behind the circumesophageal connectives (CEC). After producing separate arborization fields in the dorsal neuropile, the tracts circumscribe the base of the ipsilateral CEC, unite, and their seven fibers enter NCA2 anteriorly. Prograde diffusion reveals 4--6 NCA2 axons penetrating the corpus allatum (CA) near a cap-like neurohemal organ. These axons form the transverse allatal tract (TAT), from whence they branch amongst the CA cells, and into the "cap", the postallatal nerves, and the opposite CA. Electron microscopy of transverse sections demonstrates nine neurosecretory axons entering the SG through NCA2. Proximal to the CA, NCA2 consists of a central bundle of neurosecretory axons and a peripheral zone confluent with the CA "cap". Depending upon the level of sectioning, there are 7--20 axons at the center, and seven pass into the TAT. The peripheral zone has the structure of a neurohemal organ.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D009434	Neural Pathways	Neural tracts connecting one part of the nervous system with another.	Neural Interconnections,Interconnection, Neural,Interconnections, Neural,Neural Interconnection,Neural Pathway,Pathway, Neural,Pathways, Neural
D009474	Neurons	The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM.	Nerve Cells,Cell, Nerve,Cells, Nerve,Nerve Cell,Neuron
D009490	Neurosecretory Systems	A system of NEURONS that has the specialized function to produce and secrete HORMONES, and that constitutes, in whole or in part, an ENDOCRINE SYSTEM or organ.	Neuroendocrine System,Neuroendocrine Systems,Neurosecretory System,System, Neuroendocrine,System, Neurosecretory,Systems, Neuroendocrine,Systems, Neurosecretory
D003035	Cobalt	A trace element that is a component of vitamin B12. It has the atomic symbol Co, atomic number 27, and atomic weight 58.93. It is used in nuclear weapons, alloys, and pigments. Deficiency in animals leads to anemia; its excess in humans can lead to erythrocytosis.	Cobalt-59,Cobalt 59
D003058	Cockroaches	Insects of the order Dictyoptera comprising several families including Blaberidae, BLATTELLIDAE, Blattidae (containing the American cockroach PERIPLANETA americana), Cryptocercidae, and Polyphagidae.	Blaberidae,Blattaria,Blattidae,Blattodea,Cryptocercidae,Dictyoptera,Polyphagidae,Cockroach,Blattarias,Blattodeas,Cockroache,Cockroachs,Dictyopteras
D003335	Corpora Allata	Paired or fused ganglion-like bodies in the head of insects. The bodies secrete hormones important in the regulation of metamorphosis and the development of some adult tissues.	Corpus Allatum,Corpus Cardiacum,Allata, Corpora,Allatum, Corpus
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D001369	Axons	Nerve fibers that are capable of rapidly conducting impulses away from the neuron cell body.	Axon