494 LABORATORY MANUAL OF HUMAN ANATOMY 



Incise the ductus choledochus, the ductus pancreaticus [Wir- 

 sungi], and the ductus pancreaticus accessorius [Santorini], 

 pass probes (or broom-straws) through these into the duodenum ; 

 just below the pylorus, apply two ligatures about the duodenum, 

 cut between, and remove the duodenum from the abdomen. Re- 

 move ligatures, wash the lumen out carefully, incise along the 

 convex margin, and study in the duodenum 



(a) Circular folds (plicae circular -es [Kerkringi]). 



( b ) Intestinal villi ( villi intestinales ) . 



(c) Solitary lymph-nodes (noduli lymphatici solitarii). 



(d) Duodenal papilla (papilla duodeni [Santorini]). 



(e) Longitudinal fold of duodenum (plica longitudinalis duodeni}. 



Note that this fold is formed by the ductus choledochus and leads 

 up to the common opening of the ductus choledochus and ductus 

 pancreaticus. 



Spread the duodenum out upon a cork dissecting tray, pin it 

 down, and study its coats. 



(a) Serous coat (tunica serosa). 



(b) Muscular coat (tunica muscularis). 



(ba) Longitudinal layer (stratum longitudinale) . 



(bb) Circular layer (stratum circular e}. 



(c) Submucous coat (tela submucosa). 



(d) Mucous coat (tunica mucosa}. 



(da) Muscular layer of the mucosa (lamina muscularis mucosae). 



(db) Proper mucous coat (tunica propria mucosa). 



FIG. 260. 



Ductus pancreaticus [Wirsungi] 



M. sphincter duct. pan. > . cho]edoch 



Ductus choledochus 



v Fibrae longae 

 M. sphincter Duct, choledbch. 



Sphincter muscle of the ductus choledochus and of the ductus pancreaticus in man (after Hendrick- 

 son). (From Poirier et Charpy, Traite d'Anat. hum., Paris, 1901, 2 ed., t. iv. p. 796, Fig. 411.) 



Use a lens and look for the duodenal glands of Brunner (Gl. 

 duodenales [Brunneri] ) in the tela submucosa. 



Throw the lower end of the ductus choledochus and a small 

 adjacent portion of the duodenum into a dish containing equal 

 parts of nitric acid, alcohol, and glycerin for a few hours. Then 

 transfer to water, and with delicate instruments isolate the 



