THE UTERUS AND ITS APPENDAGES. 189 



rior fourth. It is invested by peritoneum posteriorly, and in front for its 

 upper three- fourths. 



Cervix, or Neck, is the lower constricted portion, about i^ inch long, 

 walls % inch in thickness, and is embraced for X to X inch bv tlie u PP er 

 extremity of the vagina. 



Cavity of the Body,B is small and triangular, flattened from before back- 

 wards, about I y% inch in length, and has two lateral Cornua above, and 

 a constricted orifice the Os Internum Uteri at its lower angle, opening 

 into the cavity of the cervix. 



Cavity of the Cervix, is spindle-shaped, about 1^ inch long, and presents 

 on its inner surface transverse folds of mucous membrane proceeding from 

 a longitudinal fold, giving an appearance named the Arbor Vitae.* 



Os Uteri or Os Tinea, is a transverse orifice at the lower jsnd of the 

 cervical cavity, opening into the vagina, and having an anterior and a 

 posterior lip. 



FIG. 94. 



Enumerate the Ligaments of the Uterus. The proper ligaments of 

 the uterus are 6 in number, 2 Anterior, or Utero-vesico-pubic, 2 Posterior, or 

 Utero-recto- sacral, and 2 Lateral, or Broad Ligaments, all composed of peri- 

 toneum. The 



Broad Ligaments, pass from the sides of the uterus to the lateral walls 



of the pelvis, and form a septum across the pelvic cavity. They contain, 



between the two folds of peritoneum of which they are composed, the 



Fallopian tubes, the Ovaries, and the so-called Round Ligaments. 



What are the Round Ligaments of the Uterus ? They are two cords, 



composed of areolar and fibrous tissue, muscular fibres, vessels and nerves, 



extending one on each side, from the lateral aspects of the fundus uteri, through 



the inguinal canals, to the labia majora, where they are lost. Each ligament 



lies, for a part of its course, between the two layers of the broad ligament, and 



is covered by a process of peritoneum. ( G Fig. 94.) 



