Topic:Myenteric Plexus
The myenteric plexus, also known as Auerbach's plexus, is a network of neurons located between the longitudinal and circular layers of the muscularis externa in the gastrointestinal tract of horses. It is a component of the enteric nervous system, which regulates various aspects of gut function, including motility and coordination of peristalsis. The myenteric plexus facilitates communication between the central nervous system and the gastrointestinal tract, influencing processes such as digestion and nutrient absorption. This section compiles peer-reviewed research studies and scholarly articles that explore the structure, function, and physiological role of the myenteric plexus in equine gastrointestinal health.
Muscle thickness and neuron density in the caecum of horses with chronic recurrent caecal impaction. In this study, the hypothesis that caecal smooth muscle layers would be thinner and the linear neuron density of myenteric plexus greater was tested in normal horses compared to those with chronic recurrent caecal impaction. Four normal horses and 18 horses with chronic recurrent caecal impaction were subjected to euthanasia and 7 tissue samples were collected from each horse at different regions of the caecum (apex, dorsal body, cranial base, dorsal base, caudal base, caudal body, ventral body). Twelve horses with chronic recurrent caecal impaction were treated surgically. Only one tissue sam...
Adrenergic, cholinergic, and nonadrenergic-noncholinergic intrinsic innervation of the jejunum in horses. To determine the major neurotransmitters that regulate contractile activity in the jejunum of horses. Methods: Jejunal specimens from 65 horses without gastrointestinal tract lesions. Methods: Jejunal smooth muscle strips, oriented in the plane of the circular or longitudinal muscular layer, were suspended isometrically in muscle baths. Neurotransmitter release was induced by electrical field stimulation (EFS) delivered at 30 and 70 V intensities and at various frequencies on muscle strips maintained at low or high muscle tone. To detect residual nonadrenergic-noncholinergic neurotransmission,...
Involvement of nitric oxide in inhibitory neuromuscular transmission in equine jejunum. To evaluate the role of nitric oxide (NO), vasoactive intestinal peptide (VIP), and a transmitter acting through an apamin-sensitive mechanism in mediating inhibitory transmission in the equine jejunal circular muscle, and to determine the distribution of VIP-and NO-producing nerve fibers in the myenteric plexus and circular muscle. Methods: Circular muscle strips were suspended in tissue baths containing an oxygenated modified Krebs solution and attached to isometric force transducers. Responses to electrical field stimulation (EFS), tetrodotoxin, the NO antagonists L-N-nitro-arginine-methyl-...