| OCR Text |
Show 1883.] ANATOMY OF SUS SALVANIUS. 415 two cones united by the apices, the bases being oval, however, instead of round. The lumen of the first part of the colon is greatest. At the top of the coil the intestine loops round, and, reversing its course, passes out at the base of the coil, ascends in front of the duodenum aud passes to the left, then finally enters the pelvis. The arrangement is essentially that found in the Pig. The various coils of colon are united firmly together by fibrous tissue : the first part is crenated in outline; but the remainder is regular and uniform. The large intestine was found, on opening the abdominal cavity, to occupy chiefly the left side, and presented a marked contrast to the small intestine from its somewhat dark colour as compared with the dirty-yellow colour of the latter. The liver l has no suspensory ligaments or round ligament. The umbilical fissure is well marked, and divides the viscus into two segments of nearly equal size. The right central lobe is considerably larger than the left, while in the Pig they are of almost equal size. The free border of the right central lobe is broken by a cystic fissure of small size. The superior or diaphragmatic surface of the left central lobe, and partially also that of the right, is excavated deeply, and the hollow filled up by the sac of a cvsticercus, of which two were found-this one attached to the liver, and a second, free, in the abdominal cavity. The attached border of the right segment of the liver is notched for the vena cava, which is superficially placed and does not tunnel through the substance of the liver as in the specimen of Sus scrofa before me. The condition which obtains here is precisely that which was found by Prof. Flower to exist in Phaco-chcerus and Potamo cheer us, notes on the dissections of which he has kindly placed at m y disposal. In both of these genera the vena cava is superficial. The Spigelian lobe is well defined, but does not form any projection. The caudate lobe is well defined, and seems to have a tendency to be more complicated than in the Pig. The omentum is small in quantity and shrivelled up in bands ; it is also characterized by the absence of fat. Immediately below the cartilages of the larynx situated on the front of the trachea is the thyroid gland, which measures 3*2 cm. in length (in the axial line) by 1*3 cm. broad and 1*4 cm. in depth (dorso-ventrally). The trachea measures about 9 cm. in length ; at its posterior end it divides into two short bronchi (1 cm. long) which immediately enter the lungs. About 2*5 cm. above the bifurcation, the trachea gives off a branch to the upper lobe of the right lung. This branch is about one third the size of the bronchus, and, immediately on entering the lung, splits up into two branches, one of which runs upwards, the other downwards. This arrangement of the three bronchi is precisely what is found in the Pig. 1 The description of this organ given here is on the plan proposed by Prof. Flower in his Hunterian Lectures at the Royal College of Surgeons on the organs of digestion in the Mammalia, published in the ' Medical Times and Gazette ' Feb. 24 to Dec. 1872-a source which I have freely availed myself of in the description of the digestive organs in the specimen under consideration. |
