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Neuroeffector apparatus in gastrointestinal smooth muscle organs
Author(s) -
Sanders Kenton M.,
Hwang Sung Jin,
Ward Sean M.
Publication year - 2010
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.2010.196030
Subject(s) - interstitial cell of cajal , neurotransmission , neuroeffector , neuroscience , neurotransmitter , biology , neuromuscular junction , excitatory postsynaptic potential , tunica , receptor , inhibitory postsynaptic potential , smooth muscle , anatomy , endocrinology , central nervous system , biochemistry , stimulation
Control of gastrointestinal (GI) movements by enteric motoneurons is critical for orderly processing of food, absorption of nutrients and elimination of wastes. Work over the past several years has suggested that motor neurotransmission is more complicated than simple release of transmitter from nerve terminals and binding of receptors on smooth muscle cells. In fact the ‘neuro‐effector’ junction in the tunica muscularis might consist of synaptic‐like connectivity with specialized cells, and contributions from multiple cell types in integrated post‐junctional responses. Interstitial cells of Cajal (ICC) were proposed as potential mediators in motor neurotransmission based on reduced post‐junctional responses observed in W mutants that have reduced populations of ICC. More recent studies on W mutants have contradicted the original findings, and suggested that ICC may not be significant players in motor neurotransmission. This review examines the evidence for and against the role of ICC in motor neurotransmission and outlines areas for additional investigation that would help further resolve this controversy.