1404 



THE URINOGENITAL ORGANS 



there are frequently one or more small pedunculated vesicles. These are termed 

 the hydatids of Morgagni (appendices vesiculosty. 



The course pursued by the Fallopian tube has been given in its relations to the 

 ovary on page 1400. 



Structure. The Fallopian tube consists of three coats serous, muscular, and mucous. 



The external or serous coat (tunica serosa) is peritoneal. Beneath this lies the tunica 

 adventitia, composed of lax connective tissue. 



The middle or muscular coat (tunica muscularis) consists of an external longitudinal layer 

 (stratum longitudinale) , and an internal circular layer (stratum circulare} of smooth muscle fibres 

 continuous with those of the uterus; near the uterine end of the tube an inner longitudinal layer 

 is found. 



The internal or muocus coat (tunica mucosa) is continuous with the mucous lining of the 

 uterus and, at the free extremity of the tube, with the peritoneum. It is thrown into branched 

 longitudinal folds or villi (plicae tubariae), which in the outer, larger part of the tube or ampulla 

 (plicae ampullares) are much more extensive than in the narrow canal of the isthmus (plicae 

 isthmicae). The lining epithelium is simple ciliated. This form of epithelium is also found on 

 the inner surface of the fimbrise, while on the outer or serous surfaces of these processes the epi- 

 thelium gradually merges into the endothelium of the peritoneum. 



Mmbria ovarica. 

 FIG. 1160. Dissection of uterine appendages, seen from behind. (Henle.) 



Vessels and Nerves. The chief artery of the tube is the tubal branch of the uterine artery 

 (ramus tubarius] (Fig. 1168). It also receives branches from the ovarian (Fig. 1168). Some 

 of the tubal veins empty into the uterine veins, some into the ovarian veins. The lymphatics 

 (Fig. 1169) coming from the tube unite with the trunks coming from the uterus and ovary and 

 terminate in the lateral aortic nodes. The nerves come from the same plexuses that send 

 branches to the uterus and ovary. 



Applied Anatomy of the Appendages. Extrauterine pregnancy most commonly occurs in 

 the ampulla of the tube. The product of the conception may escape through the ostium abdomi- 

 nale or the walls of the tube may rupture, a violent hemorrhage resulting. Pelvic peritonitis 

 is a not uncommon sequence of tubal disease. Salpingitis is inflammation of the mucous coat 

 of the tube interstitial salpingitis of the middle coat; perisalpingitis of the peritoneal coat. 

 If inflammation closes the uterine and the abdominal ends of the tube, mucus gathers and dis- 

 tends the tube (hydrosalpinx). If purulent matter gathers, the condition is known as pyosalpinx. 



THE UTERUS, OR WOMB (Figs. 1161, 1164). 



The uterus is the organ of gestation, receiving the fecundated ovum in its cavity, 

 retaining and supporting it during the development of the fetus, and becoming 

 the principal agent in its expulsion at the time of parturition. It is a hollow 



