DISEASES OF THE GENERATIVE ORGANS, 



DESCRIPTION OF PLATES. 



Plate XII : 



Fetus with its membranes at mid term. The uterus is opened on the left 

 side. In the uterus the fetus is surrounded by several membrances, 

 which are known as the amnion, or inner layer, the allantois, or central 

 layer, and the chorion, or outer layer. The amnion, or inner mem- 

 brane, is nearest the fetus, and forms a closed sac around It, filled with 

 a fluid known as liquor amnii, in which the fetus floats. 



The allantois is the central membrance, and is comjwsed of two layers, 

 which form a closed sac in connection with the urachus, or the tube 

 which extends from the fetal bladder through the umbilical cord. The 

 one layer of the allantois is spread over the outer surface of the amnion 

 and the other over the inner surface of chorion. The allantois also 

 contains a fluid which is known as the allnntoid liquid. 



The chorion is the outer envelope or membrane of the fetus, completely 

 Inclosing the fetus with its other membranes. On the outer surface 

 of this membrane are found the fetal placentuhe, or cotyledons, which, 

 through their attachment to the maternal cotyledons, furnish the fetus 

 with the means of sustaining life. The relation of the fetal and mater- 

 nal cotyledons to each other is illustrated on the following plate. 

 Plate XIII : 



Fig. 1. Uterus of the cow during pregancy, laid open to show the coty- 

 ledons (d) on the internal surface of uterus (e). The ovary (a) is 

 shown cut across, and the two halves laid open to show the position of 

 the discharged ovum at (o'). 



Fig. 2. Illustrates the relation of the fetal and maternal parts of a coty- 

 ledon. A portion of the uterus (.4) is shown with the maternal coty- 

 ledon (BB) attached to it. The fetal portion (D) consists of a mass 

 of very minute hairlike processes on the chorion (E), which fit into 

 corresponding depressions or pits of the maternal portion. Each por- 

 tion is abundantly supplied with blood vessels, so that a ready inter- 

 change of nutritive fiuid may take place between mother and fetus. 

 Plate XIV : 



Fig. 1. Taken from Furstenberg-Leisering, Anatomie nnd Physiologic des 

 Rindes. Fetal calf with a portion of the wall of the abdominal cavity 

 of the right side and the stomach and intestines removed to illustrate 

 the nature of the umbilical or navel cord. It consists of a tube (1-1') 

 into which pass the two umbilical arteries (3) carrying blood to the 

 placenta in the uterus or womb and the umbilical vein (4) bringing 

 the blood back and carrying it into the liver. The cord also con- 

 tains the urachus (2'), which carries urine from the bladder (2) 

 through the cord. These vessels are all obliterated at birth. 5. liver: 

 5', lobe of same, known as the lobus Spiegelii ; 5", gall bladder; 

 6, right kidney; 6', left kidney; 6", ureters, or the tubes conducting 

 the urine from the kidneys to the bladder; 7, rectum, where it has 

 been severed in removing the intestines; 8, uterus of the fetus, cut 

 off at the anterior extremity; 9, aorta; 10, posterior vena cava. 

 212 



