NO. 9 MUSCULATURE OF THE BLUE CRAB COCHRAN 73 



21^. Musculus cardiacus anterior mcsalis. Single. — If one detaches 

 the anterior gastric muscles carefully, the weak and poorly developed 

 strands of the anterior cardiac muscle may be seen. It arises under- 

 neath the former, in front of the anterior median part of the meso- 

 cardiac ossicle (/), passing forward and downward over the ante- 

 rior wall of the stomach, and dividing into numerous fibers before it 

 reaches its attachment above the esophagus. (Fig. 29.) 



214. Musculus cardiacus anterior lateralis. One pair. — The fine 

 strands of this muscle arise on the anterior border of the anterolateral 

 cardiac plate ( Cd Al) and go upward as a thin sheet of very loosely- 

 knit fibers to their attachment near the median line just above the 

 esophagus, close to that of the preceding muscle. (Fig. 29.) 



275. Musciili circumoesophagci. Many. — Taken all together, these 

 numerous muscle fibers go to make up a band surrounding the esopha- 

 gus. Individually they are very small. (Fig. 30.) 



216 a-n. Musciili pylorici a-n. Fourteen pairs. — It is most con- 

 venient to list these numerous small muscles controlling the constriction 

 of the pylorus in tabular form, giving the ossicles between which each 

 muscle extends. The nuinbering of each individual muscle has been 

 purely arbitrary and without other significance than one of identi- 

 fication. (Fig. 30.) 



a. Lateral cardiopyloric ossicle {XI 1 1) to anterior pleuropyloric 

 ossicle {XX I II). 



b. Lateral cardiopyloric ossicle {XIII) to posterior mesopyloric os- 

 sicle {XV). 



c. Middle supra-ampullary ossicle {XXI) to posterior mesopyloric 

 ossicle {XV). 



d. Middle supra-ampullary ossicle {XXI) to uropyloric ossicle 

 {XVI). 



e. Ampulla (/^//i/?) to uropyloric ossicle {XVI). 



f. Posterior supra-ampullary ossicle {XXII) to middle pleuro- 

 pyloric ossicle {XXIV). 



g. Posterior supra-ampullary ossicle {XXII) to uropyloric ossicle 

 {XVI). 



It. Posterior supra-ampullary ossicle {XXII) to pyloric valve. 



(PV). 



i. Pre-ampullary ossicle {XVIII) to middle supra-ampullary os- 

 sicle {XXI). 



j. Middle supra-ampullary ossicle {XXI) to ampulla {Amp). 



k. Anterior pleuropyloric ossicle {XXIII) to posterior mesopy- 

 loric ossicle {XV). 



