Figure 1 - Lower esophageal sphincter (LES) fibers.
From the following article
Medical and endoscopic management of achalasia
Nonko Pehlivanov and Pankaj Jay Pasricha
GI Motility online (2006)
doi:10.1038/gimo52
The two components of the LES are the horizontally oriented clasp fibers and the more vertically oriented sling fibers. (Source: Netter medical illustration with permission from Elsevier. All rights reserved.)
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