42 



OBSTETRICAL ANATOMY. 



conveyed from the uterus by corresponding veins, which are more 

 numerous than the arteries, and are capable of great distention. Tliey 

 have no valves. In animals which have bred frequently, the vessels are 

 greatly enlarged and very fiexuous ; indeed, from an early period the 

 arteries are remarkable for their large size, their tortuous course, and 

 their frequent anastomoses ; while the considerable calibre of the veins 

 is as conspicuous as the complex networks they form. 



The lymphatic vessels issuing from the organ are as remarkable for 

 their large size as for their number ; they all proceed towards the sub- 

 lumbar region. 



The nerves are derived from the small mesenteric and pelvic plexuses. 



rig. 22. 

 Nerves of Maee's Uterus. 

 a, Anterior Abdnmiual Ganglion ; b, Posterior Abdominal Ganglion ; c, A 

 Lumbar Ganglion of the Sympathetic Chain ; d', d. Anterior Hypogastric 

 Nerves ; e. Lymphatic Connection with the Right Pelvic Plexus : f, ;/, 

 Branches from the Third and Fourth Sacral Nerves to the Pelvic Plexus ; 

 1, Ovarian Artery ; 2, Uterine Artery ; 3, Uterine and Vesical Artery ; 

 4, Branch of the Internal Pudic Vein ; 5, Ovarian and Uterine Vein ; (3, Left 

 LTterine Cornu. 



"When the gravid uterus increases in volume, it pushes the pelvic 

 flexure of the colon before it as it advances into the abdominal cavity, on 

 to the floor of which it gradually descends and rests until the termina- 

 tion of pregnancy. As has been mentioned, in this advance and descent 

 it carries with it the cervix and vagina, which is considerably length- 

 ened, the traction being extended even to the vulva, this appearing 

 to be buried between the ischiatic tuberosities toward the end of 



pregnancy. 



Differences. 

 Coic. 



The uterus of the Cow, with regard to its general disposition in the 

 pelvic and abdominal cavities, does not offer any striking differences 



