280 GENERATION. 



the sides of the uterus, the peritoneal covering, a little below 

 the entrance of the Fallopian tubes, becomes loosely attached, 

 and leaves a line for the penetration of the vessels and nerves. 

 Fig. 28, giving a view of the interior of the uterus, shows 

 a triangular cavity, with two cornua, corresponding to the 



FIG. 28. 



Interior of the virgin uterus (two-thirds of the natural size). 1, cavity of the body of the ute- 

 rus; 2, canal of the cervix uteri, with the arbor vitae and ovules of Naboth; 3, os internum; 

 4, os externum; 5, 5, openings of the Fallopian tubes. (LirsciiKA, Anatomic des Menscken, 

 Tubingen, 1864, Bd. ii., S. 349.) 



openings of the Fallopian tubes, and exceedingly thick walls, 

 the greatest part of which is composed of layers and bands 

 of non-striated muscular fibres. 



The muscular walls of the uterus are composed of fibres 

 of the involuntary variety, arranged in several layers. These 

 fibres are spindle-shaped, always nucleated, the nucleus pre- 

 senting one or two large granules, which have been taken for 

 nucleoli. They are closely bound together, so that they are 

 isolated with great difficulty. In addition to an amorphous 

 adhesive substance between the muscular fibres, we find nu- 

 merous rounded and spindle-shaped cells of connective tissue 

 of the variety called embryonic, and a few elastic fibres. The 

 muscular tissue of the uterus is remarkable from the fact that 

 the fibres enlarge immensely during gestation, becoming, at 



