. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 214 arising from the outer longitudinal muscle coat and running up on the common bile-duct can, however, be demonstrated in this specimen. The Cystic Duct of Man. In consideration of the apparent diversity of opinion as to the presence of a sphincter muscle in the cystic duct or at the neck of the gall-bladder, the results of our work on the cystic duct of man will be given. Macerations of the cystic duct in a mixture of nitric acid, glycerine and water showed the arrangement of smooth muscle to be plexiform. Longitudinal cel
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 214 arising from the outer longitudinal muscle coat and running up on the common bile-duct can, however, be demonstrated in this specimen. The Cystic Duct of Man. In consideration of the apparent diversity of opinion as to the presence of a sphincter muscle in the cystic duct or at the neck of the gall-bladder, the results of our work on the cystic duct of man will be given. Macerations of the cystic duct in a mixture of nitric acid, glycerine and water showed the arrangement of smooth muscle to be plexiform. Longitudinal celloidin sections of the cystic duct demonstrated smooth muscle running in three directions, viz. transverse, longitudinal, and diagonal. The transverse bundles are most numerous; the longitudinal and diagonal bundles are about equal in number. In that portion of the cystic duct nearest the neck of the gall-bladder, the amount of muscle is con- siderable, but this gradually diminishes in amount as the common bile-duct is appro- ached. At the junction of the cystic, hepatic and common bile-duct the quantity of muscle present is very small. These sec- tions also show muscle fibres in those folds of the cystic duct which are known as the valves of Heister. The fact that muscle is present in these folds has been noted before by Mac Alister and he does not undertake to describe the course pursued by the muscle bundles. In a set of serial longitudinal sections of the entire human cystic duct, I have found the arrangement represented by the schema given in Fig. 17. It is based upon study of the serial sections, and shows: 1) That the transverse muscle bundles of the cystic duct are not limited to the Fig. 17. The cystic duct of man, showing the Heisterian valve; also, a diagram of the musculature of the Heisterian valve. wall proper, but at the level of the valves of Heister also run around in the valve in a circular direction. It is just as if the wall of the duct had been invaginated
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