Characteristics of function-specific pathways in the sympathetic nervous system

Article Abstract:

The sympathetic nervous system forms part of the autonomic nervous system, which is responsible for the regulation of all tissue and organ functions except those of the skeletal muscle fibers. Results from early studies on the system have created a purely neuroendocrine view of its functions. However, studies using various neuroscientific techniques and analyzing the system from a molecular, cellular and integrative perspective have established the existence of specialized characteristics of its functional pathways. These findings reveal the inadequacy of a purely neuroendocrine concept of the system.

Neurons, Nervous system, Sympathetic, Sympathetic nervous system, Nervous system, Autonomic, Autonomic nervous system

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Quantal analyses of quantal analysis

Article Abstract:

Quantal analysis of synaptic transmission depends on parameters n(number of release sites), p(probability that an action potential will result in release) and q(magnitude of the postsynaptic response to release from a single site). A giant quantum depends on the sum of responses to an action potential in an axonal branch which in turn is dependent on number of release sites supplied by the branch on p and q. Probability of transmission would determine the number of giant quanta and remains constant with other presynaptic changes. A change in p results to change in quantal amplitude.

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'Cartellian' competition at the neuromuscular junction

Article Abstract:

The consistency with which several motor axons innervating muscle fibers are reduced to a single axon during early postnatal life has led scientists to speculate on the existence of competition among motorneurons during synapse elimination. However, evidence suggests that the competition occurs between synapse sets, rather than between synapses themselves. Hence, elimination entails the combined or cartel-like action of synaptic groups, behaving in such a manner that they monopolize the innervationof muscle fibers.

Axons, Synapses

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