. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 213 in the submucosa of the iutestinal wall. The large opening — to the right — is the lumen of the ductus communis choledochus; the narrow slit — to the left — represents the collapsed lumen of the duct of WiRSUNG. At the point X, muscle bundles cut in cross section and sometimes diagonally are seen. These bundles represent those fibres of the sphincter muscle which do not run entirely around the common bile-duct. They become detached at the side of the duct from the sphincter proper and turn forward. These bundles then run
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 213 in the submucosa of the iutestinal wall. The large opening — to the right — is the lumen of the ductus communis choledochus; the narrow slit — to the left — represents the collapsed lumen of the duct of WiRSUNG. At the point X, muscle bundles cut in cross section and sometimes diagonally are seen. These bundles represent those fibres of the sphincter muscle which do not run entirely around the common bile-duct. They become detached at the side of the duct from the sphincter proper and turn forward. These bundles then run forward, under the common bile-duct and gradually approach the bundles of the opposite side; they finally end free in the connective tissue of the submucosa near the orifice of the common bile-duct. These bundles correspond to the fibres, X, of the macerated specimen. It is probable that the fibres, K, of the macerated specimen are also included among the bundles described above, but we have not been able to distinguish them in the sections from the others. The remaining bundles of muscle about the common bile-duct belong to the sphincter muscle proper: they correspond to the fibres, 5, of the macerated specimen. A bundle of muscle fibres cut longitudi- nally is seen running between the lumen of the duct of Wirsung and that of the common bile-duct. I consider this to be a bundle of the sphincter muscle and belive that it corresponds to the "double sphincter" arrangement found in the dog and rabbit, and described Fig. 16. Cross-section at the entrance of the common bile-duct into the intestinal wall of man. X ^0. The second section (Fig. 16) represents the common bile-duct just before it has penetrated the muscle coats of the intestine. Around the common bile-duct, are seen muscle bundles cut transversely. These represent the fibres, K^ of the macerated specimen. No muscle fibres. Please note that these images are extracted from scanned page images that
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