. An introduction to the study of mammals living and extinct. Mammals. 400 UNGULATA right lateral Fig. 160.—Under surface of the liver of the Horse, fissure; M, left lateral lobe; Ic, left central lobe; t-c, right central lobe; rl, right lateral lobe; s, Spigelian lobe; c, caudate lobe. In most works on the anatomy of the Horse this has been confounded with the Spigelian lobe of man. There is no gaU-bladder (as in aU other Perisso- dactyles), and the biliary duct enters the duodenum about 6 inches from the pylorus. The pancreas has two lobes orbranches— a long one passing to the left an
. An introduction to the study of mammals living and extinct. Mammals. 400 UNGULATA right lateral Fig. 160.—Under surface of the liver of the Horse, fissure; M, left lateral lobe; Ic, left central lobe; t-c, right central lobe; rl, right lateral lobe; s, Spigelian lobe; c, caudate lobe. In most works on the anatomy of the Horse this has been confounded with the Spigelian lobe of man. There is no gaU-bladder (as in aU other Perisso- dactyles), and the biliary duct enters the duodenum about 6 inches from the pylorus. The pancreas has two lobes orbranches— a long one passing to the left and reachingthe spleen, and a shorter right lobe. The principal duct enters the duodenum with the bile-duct, and there is often a second Umbilical Small duct which opens separately near to this. Circulatory and Eespiratory Organs.—The heart has the form of a rather elongated and pointed cone. There is one anterior vena cava, formed by the union of the two jugular and two axillary veins. The aorta gives off a large branch (the anterior aorta) very near its origin, from which arise—first, the left axillary, and afterwards the right axillary and the two carotid arteries. Under ordinary circumstances the Horse breathes entirely by the nasal passages, the communication between the larynx and the mouth being closed by the velum palati. The nostrils are placed laterally, near the termination of the muzzle, and are large and very dilatable, being bordered by cartilages upon which several muscles act. Immediately within the opening of the nostril, the respiratory canal sends off on its upper and outer side a diverti- culum or blind pouch (called " false nostril") of a conical form, and curved, 2 to 3 inches in depth, lying in the notch formed between the nasal and premaxiUary bones. It is lined by mucous mem- brane continuous with that of the nasal passage, but its use is not apparent. It is longer in the Ass than in the Horse. A similar structure is found in the Ehinoce
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Keywords: ., bookauthorly, bookcentury1800, bookdecade1890, booksubjectmammals
