Intramuscular Arrays

Vagal IMAs are special terminal structures with a parent axon that branches several times before terminating within the circular muscle layers. The size of the arrays can vary from several hundred microns to several millimeters in length (58). In the muscle layers, the individual terminals run for several millimeters, creating a distinct pattern of parallel elements that are

muscular (intragangllonic laminar & intramuscular) mucosal

Serosal & mesenteric muscular (intragangllonic laminar & intramuscular) mucosal

Serosal & mesenteric commonly associated with interstitial cells of Cajal (29,45,46,49,58). In contrast to IGLEs, IMAs have a distinctly different distribution, and are concentrated in the forestomach, lower esophageal sphincter, and pyloric sphincter. The highest concentration of IMAs is in the forestomach (17.3 IMAs/mm2), with fewer in the corpus (2.9 IMAs/mm2) and antrum (0.6 IMAs/mm2) (47). IMAs have been suggested to be in-series tension receptors that serve as stretch or length detectors, which possibly respond to both passive stretch and active contraction of the muscle (45,47,51). In the guinea pig esophagus, using a combination of rapid anterograde tracing and in vitro electrophysiology, there was no evidence to support the suggestion that IMs function as length receptors (49). Similarly, spinal IMAs have been located within the guinea pig colon; however, as yet they do not have a known functional correlate (54).

Baby Sleeping

Baby Sleeping

Everything You Need To Know About Baby Sleeping. Your baby is going to be sleeping a lot. During the first few months, your baby will sleep for most of theday. You may not get any real interaction, or reactions other than sleep and crying.

Get My Free Ebook

Post a comment